IMMORTALITY National IQ by Country: A Combined Ranking of 198 Countries and Territories
Difference between revisions from 2026/10/22 20:51 and 2026/10/22 20:51.
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<h1>National IQ by Country: A Combined Ranking of 198 Countries and Territories</h1>
<p><em>Updated October 2026</em></p>
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<p>Researchers have spent decades compiling estimates of average IQ by country. This post merges two large, recent compilations into one sorted list. Where both sources cover a country, the ranking uses the average of the two. Where only one source covers it, that figure is used on its own.</p>
<h2>The Sources</h2>
<ul>
<li><strong>Source A: Parra & Kirkegaard (2025), <em>National IQs: measurement and defense</em>, OpenPsych.</strong> A composite of the Lynn & Vanhanen and Lynn & Becker (Ulster Institute) datasets, Rindermann's estimates, and international scholastic assessments (PISA, TIMSS, PIRLS, World Bank test scores, Basic Skills Dataset). It covers 198 countries and territories and is scaled with the United Kingdom at 99.26.</li>
<li><strong>Source B: 2025 online-test compilation</strong> (published by WORLDOSTATS from international-iq-test.com data). It covers 126 countries.</li>
</ul>
<h2>Top 10 Highest Combined Scores</h2>
<ol>
<li>Singapore – 106.92</li>
<li>Japan – 106.15</li>
<li>Hong Kong – 106.02 (Source A only)</li>
<li>Taiwan – 105.23 (Source A only)</li>
<li>South Korea – 105.14</li>
<li>Macao – 103.90 (Source A only)</li>
<li>China – 103.70</li>
<li>Liechtenstein – 101.66 (Source A only)</li>
<li>Canada – 101.27</li>
<li>Estonia – 100.63</li>
</ol>
<h2>Regional Averages (Source A, by dataset family)</h2>
<p>Parra & Kirkegaard report regional means of roughly 100 for East Asia, 95 for Europe, 85 for Arab countries, 80 for Latin America, 75 for South Asia and 70 for Sub-Saharan Africa. Their population-weighted world average is 85.3.</p>
<h2>Full Ranking</h2>
<p>Scores are sorted from highest to lowest combined score. A dash means the country is not covered by that source.</p>
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<caption>National IQ estimates by country, combined and by source</caption>
<thead>
<tr><th scope="col">Rank</th><th scope="col">Country / Territory</th><th scope="col">Combined</th><th scope="col">Source A (Parra & Kirkegaard 2025)</th><th scope="col">Source B (Online tests 2025)</th></tr>
</thead>
<tbody>
<tr><td>1</td><td>Singapore</td><td>106.92</td><td>108.70</td><td>105.14</td></tr>
<tr><td>2</td><td>Japan</td><td>106.15</td><td>105.90</td><td>106.40</td></tr>
<tr><td>3</td><td>Hong Kong</td><td>106.02</td><td>106.02</td><td>—</td></tr>
<tr><td>4</td><td>Taiwan</td><td>105.23</td><td>105.23</td><td>—</td></tr>
<tr><td>5</td><td>South Korea</td><td>105.14</td><td>103.84</td><td>106.43</td></tr>
<tr><td>6</td><td>Macao</td><td>103.90</td><td>103.90</td><td>—</td></tr>
<tr><td>7</td><td>China</td><td>103.69</td><td>100.20</td><td>107.19</td></tr>
<tr><td>8</td><td>Liechtenstein</td><td>101.66</td><td>101.66</td><td>—</td></tr>
<tr><td>9</td><td>Canada</td><td>101.27</td><td>100.88</td><td>101.65</td></tr>
<tr><td>10</td><td>Estonia</td><td>100.62</td><td>101.86</td><td>99.39</td></tr>
<tr><td>11</td><td>Finland</td><td>100.58</td><td>100.86</td><td>100.30</td></tr>
<tr><td>12</td><td>Australia</td><td>100.56</td><td>98.55</td><td>102.57</td></tr>
<tr><td>13</td><td>Russia</td><td>100.38</td><td>97.59</td><td>103.16</td></tr>
<tr><td>14</td><td>Switzerland</td><td>100.16</td><td>99.56</td><td>100.75</td></tr>
<tr><td>15</td><td>New Zealand</td><td>100.10</td><td>98.13</td><td>102.08</td></tr>
<tr><td>16</td><td>Netherlands</td><td>99.90</td><td>100.08</td><td>99.72</td></tr>
<tr><td>17</td><td>Slovenia</td><td>99.84</td><td>97.72</td><td>101.96</td></tr>
<tr><td>18</td><td>United Kingdom</td><td>99.47</td><td>99.26</td><td>99.68</td></tr>
<tr><td>19</td><td>Vietnam</td><td>99.32</td><td>98.52</td><td>100.12</td></tr>
<tr><td>20</td><td>France</td><td>99.12</td><td>96.83</td><td>101.42</td></tr>
<tr><td>21</td><td>Belgium</td><td>99.00</td><td>97.90</td><td>100.11</td></tr>
<tr><td>22</td><td>Germany</td><td>99.00</td><td>98.35</td><td>99.64</td></tr>
<tr><td>23</td><td>Czechia</td><td>98.99</td><td>98.25</td><td>99.73</td></tr>
<tr><td>24</td><td>Spain</td><td>98.92</td><td>95.54</td><td>102.30</td></tr>
<tr><td>25</td><td>Austria</td><td>98.85</td><td>98.05</td><td>99.65</td></tr>
<tr><td>26</td><td>Poland</td><td>98.77</td><td>98.19</td><td>99.35</td></tr>
<tr><td>27</td><td>United States</td><td>98.73</td><td>97.73</td><td>99.74</td></tr>
<tr><td>28</td><td>Ireland</td><td>98.71</td><td>99.10</td><td>98.32</td></tr>
<tr><td>29</td><td>Italy</td><td>98.59</td><td>96.33</td><td>100.84</td></tr>
<tr><td>30</td><td>Belarus</td><td>98.56</td><td>95.64</td><td>101.47</td></tr>
<tr><td>31</td><td>Sweden</td><td>98.50</td><td>98.51</td><td>98.49</td></tr>
<tr><td>32</td><td>Iceland</td><td>98.34</td><td>96.68</td><td>99.99</td></tr>
<tr><td>33</td><td>Hungary</td><td>98.33</td><td>97.20</td><td>99.46</td></tr>
<tr><td>34</td><td>Luxembourg</td><td>98.23</td><td>96.47</td><td>100.00</td></tr>
<tr><td>35</td><td>Mongolia</td><td>98.12</td><td>93.37</td><td>102.86</td></tr>
<tr><td>36</td><td>Norway</td><td>98.01</td><td>97.50</td><td>98.52</td></tr>
<tr><td>37</td><td>Denmark</td><td>97.97</td><td>98.00</td><td>97.94</td></tr>
<tr><td>38</td><td>Latvia</td><td>97.84</td><td>96.85</td><td>98.84</td></tr>
<tr><td>39</td><td>Slovakia</td><td>97.84</td><td>95.93</td><td>99.76</td></tr>
<tr><td>40</td><td>Portugal</td><td>97.47</td><td>95.60</td><td>99.34</td></tr>
<tr><td>41</td><td>Croatia</td><td>97.36</td><td>95.55</td><td>99.17</td></tr>
<tr><td>42</td><td>Lithuania</td><td>97.35</td><td>96.03</td><td>98.67</td></tr>
<tr><td>43</td><td>Israel</td><td>96.47</td><td>93.88</td><td>99.07</td></tr>
<tr><td>44</td><td>Greece</td><td>96.32</td><td>92.57</td><td>100.07</td></tr>
<tr><td>45</td><td>Malta</td><td>96.09</td><td>92.98</td><td>99.19</td></tr>
<tr><td>46</td><td>Serbia</td><td>96.00</td><td>91.15</td><td>100.86</td></tr>
<tr><td>47</td><td>Armenia</td><td>95.58</td><td>88.58</td><td>102.58</td></tr>
<tr><td>48</td><td>Cyprus</td><td>95.40</td><td>92.28</td><td>98.51</td></tr>
<tr><td>49</td><td>Iran</td><td>95.00</td><td>83.71</td><td>106.30</td></tr>
<tr><td>50</td><td>Malaysia</td><td>94.72</td><td>88.96</td><td>100.48</td></tr>
<tr><td>51</td><td>Turkey</td><td>94.61</td><td>90.16</td><td>99.07</td></tr>
<tr><td>52</td><td>Bulgaria</td><td>94.55</td><td>91.30</td><td>97.79</td></tr>
<tr><td>53</td><td>Thailand</td><td>94.45</td><td>87.39</td><td>101.52</td></tr>
<tr><td>54</td><td>Ukraine</td><td>93.81</td><td>92.25</td><td>95.38</td></tr>
<tr><td>55</td><td>Kazakhstan</td><td>92.91</td><td>88.64</td><td>97.17</td></tr>
<tr><td>56</td><td>Georgia</td><td>92.79</td><td>84.99</td><td>100.59</td></tr>
<tr><td>57</td><td>Montenegro</td><td>92.75</td><td>86.84</td><td>98.65</td></tr>
<tr><td>58</td><td>Bosnia and Herzegovina</td><td>92.72</td><td>87.82</td><td>97.62</td></tr>
<tr><td>59</td><td>Moldova</td><td>92.62</td><td>87.93</td><td>97.32</td></tr>
<tr><td>60</td><td>United Arab Emirates</td><td>92.54</td><td>88.28</td><td>96.80</td></tr>
<tr><td>61</td><td>Greenland</td><td>92.26</td><td>92.26</td><td>—</td></tr>
<tr><td>62</td><td>Brunei</td><td>92.02</td><td>85.89</td><td>98.14</td></tr>
<tr><td>63</td><td>Cuba</td><td>91.96</td><td>87.90</td><td>96.02</td></tr>
<tr><td>64</td><td>Azerbaijan</td><td>91.94</td><td>85.18</td><td>98.71</td></tr>
<tr><td>65</td><td>Chile</td><td>91.88</td><td>88.37</td><td>95.38</td></tr>
<tr><td>66</td><td>Romania</td><td>91.83</td><td>87.34</td><td>96.31</td></tr>
<tr><td>67</td><td>Mauritius</td><td>91.69</td><td>86.49</td><td>96.89</td></tr>
<tr><td>68</td><td>Uruguay</td><td>91.59</td><td>88.18</td><td>95.01</td></tr>
<tr><td>69</td><td>Sri Lanka</td><td>91.48</td><td>80.94</td><td>102.02</td></tr>
<tr><td>70</td><td>Peru</td><td>91.04</td><td>82.71</td><td>99.37</td></tr>
<tr><td>71</td><td>Albania</td><td>91.02</td><td>84.85</td><td>97.19</td></tr>
<tr><td>72</td><td>Trinidad and Tobago</td><td>90.88</td><td>86.96</td><td>94.79</td></tr>
<tr><td>73</td><td>Bahrain</td><td>90.81</td><td>87.57</td><td>94.04</td></tr>
<tr><td>74</td><td>Lebanon</td><td>90.54</td><td>81.69</td><td>99.39</td></tr>
<tr><td>75</td><td>Mexico</td><td>90.52</td><td>85.52</td><td>95.51</td></tr>
<tr><td>76</td><td>Tunisia</td><td>90.52</td><td>83.52</td><td>97.51</td></tr>
<tr><td>77</td><td>North Macedonia</td><td>90.50</td><td>83.41</td><td>97.59</td></tr>
<tr><td>78</td><td>Uzbekistan</td><td>90.37</td><td>83.95</td><td>96.79</td></tr>
<tr><td>79</td><td>Myanmar</td><td>90.23</td><td>83.10</td><td>97.37</td></tr>
<tr><td>80</td><td>Jordan</td><td>90.22</td><td>83.74</td><td>96.71</td></tr>
<tr><td>81</td><td>Argentina</td><td>90.18</td><td>85.97</td><td>94.39</td></tr>
<tr><td>82</td><td>Costa Rica</td><td>89.97</td><td>85.79</td><td>94.15</td></tr>
<tr><td>83</td><td>Bermuda</td><td>89.80</td><td>89.80</td><td>—</td></tr>
<tr><td>84</td><td>Kuwait</td><td>89.64</td><td>84.26</td><td>95.02</td></tr>
<tr><td>85</td><td>Qatar</td><td>89.53</td><td>84.29</td><td>94.77</td></tr>
<tr><td>86</td><td>Palau</td><td>89.29</td><td>89.29</td><td>—</td></tr>
<tr><td>87</td><td>Egypt</td><td>89.23</td><td>81.26</td><td>97.21</td></tr>
<tr><td>88</td><td>Cook Islands</td><td>89.16</td><td>89.16</td><td>—</td></tr>
<tr><td>89</td><td>Cambodia</td><td>89.03</td><td>84.10</td><td>93.97</td></tr>
<tr><td>90</td><td>Tajikistan</td><td>88.69</td><td>83.83</td><td>93.55</td></tr>
<tr><td>91</td><td>Algeria</td><td>88.66</td><td>80.30</td><td>97.01</td></tr>
<tr><td>92</td><td>Ecuador</td><td>88.52</td><td>82.04</td><td>95.00</td></tr>
<tr><td>93</td><td>Laos</td><td>88.41</td><td>84.77</td><td>92.05</td></tr>
<tr><td>94</td><td>Brazil</td><td>88.18</td><td>83.44</td><td>92.92</td></tr>
<tr><td>95</td><td>Iraq</td><td>88.13</td><td>82.27</td><td>93.99</td></tr>
<tr><td>96</td><td>Samoa</td><td>88.00</td><td>88.00</td><td>—</td></tr>
<tr><td>97</td><td>North Korea</td><td>87.90</td><td>87.90</td><td>—</td></tr>
<tr><td>98</td><td>Colombia</td><td>87.85</td><td>82.53</td><td>93.17</td></tr>
<tr><td>99</td><td>Suriname</td><td>87.84</td><td>87.84</td><td>—</td></tr>
<tr><td>100</td><td>Kyrgyzstan</td><td>87.68</td><td>80.51</td><td>94.85</td></tr>
<tr><td>101</td><td>India</td><td>87.67</td><td>76.27</td><td>99.08</td></tr>
<tr><td>102</td><td>Oman</td><td>87.62</td><td>81.16</td><td>94.08</td></tr>
<tr><td>103</td><td>Indonesia</td><td>87.53</td><td>81.88</td><td>93.18</td></tr>
<tr><td>104</td><td>Bangladesh</td><td>87.36</td><td>78.26</td><td>96.46</td></tr>
<tr><td>105</td><td>Saudi Arabia</td><td>87.31</td><td>80.67</td><td>93.95</td></tr>
<tr><td>106</td><td>Philippines</td><td>87.17</td><td>77.68</td><td>96.66</td></tr>
<tr><td>107</td><td>Nepal</td><td>87.03</td><td>76.98</td><td>97.07</td></tr>
<tr><td>108</td><td>Bolivia</td><td>86.72</td><td>80.69</td><td>92.76</td></tr>
<tr><td>109</td><td>Marshall Islands</td><td>86.50</td><td>86.50</td><td>—</td></tr>
<tr><td>110</td><td>Madagascar</td><td>86.25</td><td>77.70</td><td>94.80</td></tr>
<tr><td>111</td><td>Dominican Republic</td><td>86.23</td><td>82.41</td><td>90.06</td></tr>
<tr><td>112</td><td>Morocco</td><td>86.20</td><td>75.63</td><td>96.78</td></tr>
<tr><td>113</td><td>Venezuela</td><td>86.01</td><td>81.00</td><td>91.02</td></tr>
<tr><td>114</td><td>El Salvador</td><td>85.47</td><td>79.87</td><td>91.07</td></tr>
<tr><td>115</td><td>Guatemala</td><td>85.03</td><td>78.78</td><td>91.29</td></tr>
<tr><td>116</td><td>Honduras</td><td>84.91</td><td>79.30</td><td>90.53</td></tr>
<tr><td>117</td><td>Panama</td><td>84.87</td><td>79.25</td><td>90.49</td></tr>
<tr><td>118</td><td>Kenya</td><td>84.66</td><td>78.10</td><td>91.22</td></tr>
<tr><td>119</td><td>Paraguay</td><td>84.66</td><td>78.56</td><td>90.76</td></tr>
<tr><td>120</td><td>Nicaragua</td><td>83.33</td><td>77.95</td><td>88.70</td></tr>
<tr><td>121</td><td>Puerto Rico</td><td>83.23</td><td>83.23</td><td>—</td></tr>
<tr><td>122</td><td>Tonga</td><td>82.61</td><td>82.61</td><td>—</td></tr>
<tr><td>123</td><td>Tanzania</td><td>82.59</td><td>75.79</td><td>89.40</td></tr>
<tr><td>124</td><td>Barbados</td><td>82.49</td><td>82.49</td><td>—</td></tr>
<tr><td>125</td><td>Fiji</td><td>82.43</td><td>82.43</td><td>—</td></tr>
<tr><td>126</td><td>Seychelles</td><td>82.38</td><td>82.38</td><td>—</td></tr>
<tr><td>127</td><td>Bahamas</td><td>82.30</td><td>82.30</td><td>—</td></tr>
<tr><td>128</td><td>South Africa</td><td>82.24</td><td>70.37</td><td>94.11</td></tr>
<tr><td>129</td><td>Pakistan</td><td>82.06</td><td>70.86</td><td>93.25</td></tr>
<tr><td>130</td><td>Gabon</td><td>81.84</td><td>78.59</td><td>85.08</td></tr>
<tr><td>131</td><td>Libya</td><td>81.78</td><td>81.78</td><td>—</td></tr>
<tr><td>132</td><td>Ethiopia</td><td>81.75</td><td>68.42</td><td>95.09</td></tr>
<tr><td>133</td><td>Uganda</td><td>81.35</td><td>72.81</td><td>89.89</td></tr>
<tr><td>134</td><td>Turkmenistan</td><td>81.26</td><td>81.26</td><td>—</td></tr>
<tr><td>135</td><td>Zimbabwe</td><td>81.20</td><td>72.20</td><td>90.21</td></tr>
<tr><td>136</td><td>Northern Mariana Islands</td><td>81.16</td><td>81.16</td><td>—</td></tr>
<tr><td>137</td><td>Mozambique</td><td>81.06</td><td>74.30</td><td>87.81</td></tr>
<tr><td>138</td><td>Palestinian Territories</td><td>81.00</td><td>81.00</td><td>—</td></tr>
<tr><td>139</td><td>Nigeria</td><td>80.51</td><td>69.67</td><td>91.35</td></tr>
<tr><td>140</td><td>Kiribati</td><td>80.45</td><td>80.45</td><td>—</td></tr>
<tr><td>141</td><td>Senegal</td><td>80.31</td><td>72.34</td><td>88.27</td></tr>
<tr><td>142</td><td>Togo</td><td>80.21</td><td>70.48</td><td>89.94</td></tr>
<tr><td>143</td><td>Yemen</td><td>80.19</td><td>67.34</td><td>93.03</td></tr>
<tr><td>144</td><td>Jamaica</td><td>79.82</td><td>79.82</td><td>—</td></tr>
<tr><td>145</td><td>Eswatini</td><td>79.73</td><td>79.73</td><td>—</td></tr>
<tr><td>146</td><td>Cameroon</td><td>78.94</td><td>67.94</td><td>89.94</td></tr>
<tr><td>147</td><td>Kosovo</td><td>78.63</td><td>78.63</td><td>—</td></tr>
<tr><td>148</td><td>Syria</td><td>78.45</td><td>78.45</td><td>—</td></tr>
<tr><td>149</td><td>Côte d'Ivoire</td><td>78.15</td><td>67.87</td><td>88.42</td></tr>
<tr><td>150</td><td>Benin</td><td>77.88</td><td>68.87</td><td>86.88</td></tr>
<tr><td>151</td><td>Angola</td><td>77.47</td><td>69.61</td><td>85.33</td></tr>
<tr><td>152</td><td>DR Congo</td><td>77.28</td><td>66.56</td><td>88.01</td></tr>
<tr><td>153</td><td>Maldives</td><td>77.26</td><td>77.26</td><td>—</td></tr>
<tr><td>154</td><td>Timor-Leste</td><td>77.08</td><td>77.08</td><td>—</td></tr>
<tr><td>155</td><td>Ghana</td><td>77.05</td><td>63.85</td><td>90.25</td></tr>
<tr><td>156</td><td>Zambia</td><td>77.00</td><td>77.00</td><td>—</td></tr>
<tr><td>157</td><td>Burundi</td><td>76.76</td><td>76.76</td><td>—</td></tr>
<tr><td>158</td><td>Bhutan</td><td>76.31</td><td>76.31</td><td>—</td></tr>
<tr><td>159</td><td>Sudan</td><td>76.26</td><td>76.26</td><td>—</td></tr>
<tr><td>160</td><td>Dominica</td><td>75.84</td><td>75.84</td><td>—</td></tr>
<tr><td>161</td><td>Afghanistan</td><td>75.70</td><td>75.70</td><td>—</td></tr>
<tr><td>162</td><td>Guyana</td><td>75.57</td><td>75.57</td><td>—</td></tr>
<tr><td>163</td><td>St. Kitts and Nevis</td><td>75.52</td><td>75.52</td><td>—</td></tr>
<tr><td>164</td><td>Antigua and Barbuda</td><td>75.47</td><td>75.47</td><td>—</td></tr>
<tr><td>165</td><td>Solomon Islands</td><td>75.31</td><td>75.31</td><td>—</td></tr>
<tr><td>166</td><td>Rwanda</td><td>74.91</td><td>74.91</td><td>—</td></tr>
<tr><td>167</td><td>Comoros</td><td>74.77</td><td>74.77</td><td>—</td></tr>
<tr><td>168</td><td>Grenada</td><td>74.67</td><td>74.67</td><td>—</td></tr>
<tr><td>169</td><td>Botswana</td><td>74.08</td><td>74.08</td><td>—</td></tr>
<tr><td>170</td><td>Nauru</td><td>73.57</td><td>73.57</td><td>—</td></tr>
<tr><td>171</td><td>Vanuatu</td><td>73.36</td><td>73.36</td><td>—</td></tr>
<tr><td>172</td><td>Mauritania</td><td>73.10</td><td>73.10</td><td>—</td></tr>
<tr><td>173</td><td>Haiti</td><td>72.74</td><td>72.74</td><td>—</td></tr>
<tr><td>174</td><td>Eritrea</td><td>72.26</td><td>72.26</td><td>—</td></tr>
<tr><td>175</td><td>Papua New Guinea</td><td>71.77</td><td>71.77</td><td>—</td></tr>
<tr><td>176</td><td>Burkina Faso</td><td>71.29</td><td>71.29</td><td>—</td></tr>
<tr><td>177</td><td>Lesotho</td><td>71.29</td><td>71.29</td><td>—</td></tr>
<tr><td>178</td><td>Cape Verde</td><td>71.26</td><td>71.26</td><td>—</td></tr>
<tr><td>179</td><td>St. Vincent and the Grenadines</td><td>69.97</td><td>69.97</td><td>—</td></tr>
<tr><td>180</td><td>Equatorial Guinea</td><td>69.67</td><td>69.67</td><td>—</td></tr>
<tr><td>181</td><td>Namibia</td><td>69.67</td><td>69.67</td><td>—</td></tr>
<tr><td>182</td><td>Guinea</td><td>69.55</td><td>69.55</td><td>—</td></tr>
<tr><td>183</td><td>Congo (Brazzaville)</td><td>68.79</td><td>68.79</td><td>—</td></tr>
<tr><td>184</td><td>Somalia</td><td>67.90</td><td>67.90</td><td>—</td></tr>
<tr><td>185</td><td>Liberia</td><td>67.22</td><td>67.22</td><td>—</td></tr>
<tr><td>186</td><td>St. Lucia</td><td>67.11</td><td>67.11</td><td>—</td></tr>
<tr><td>187</td><td>Mali</td><td>66.93</td><td>66.93</td><td>—</td></tr>
<tr><td>188</td><td>Central African Republic</td><td>66.66</td><td>66.66</td><td>—</td></tr>
<tr><td>189</td><td>Belize</td><td>66.29</td><td>66.29</td><td>—</td></tr>
<tr><td>190</td><td>Djibouti</td><td>66.10</td><td>66.10</td><td>—</td></tr>
<tr><td>191</td><td>South Sudan</td><td>65.84</td><td>65.84</td><td>—</td></tr>
<tr><td>192</td><td>Chad</td><td>65.73</td><td>65.73</td><td>—</td></tr>
<tr><td>193</td><td>Malawi</td><td>65.68</td><td>65.68</td><td>—</td></tr>
<tr><td>194</td><td>Guinea-Bissau</td><td>64.26</td><td>64.26</td><td>—</td></tr>
<tr><td>195</td><td>Gambia</td><td>63.70</td><td>63.70</td><td>—</td></tr>
<tr><td>196</td><td>Sierra Leone</td><td>63.18</td><td>63.18</td><td>—</td></tr>
<tr><td>197</td><td>Niger</td><td>62.40</td><td>62.40</td><td>—</td></tr>
<tr><td>198</td><td>São Tomé and Príncipe</td><td>62.26</td><td>62.26</td><td>—</td></tr>
</tbody>
</table>
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<h2>How to Read the Table</h2>
<p>The two sources use different scales. Source A anchors the United Kingdom at 99.26, while Source B reports raw online-test averages, so the two columns are not interchangeable. The Combined column is a simple average of whichever columns have a value. Countries with only one source are ranked on that single figure.</p>
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<p><strong>Sources:</strong> Parra, L. & Kirkegaard, E. O. W. (2025), <em>National IQs: measurement and defense</em>, OpenPsych (DOI 10.26775/OP.2025.11.17); WORLDOSTATS, <em>Average IQ by Country 2025</em>, citing international-iq-test.com; Ulster Institute for Social Research, Lynn & Becker, <em>The Intelligence of Nations</em> (2019).</p>
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