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. 2006 Aug 28;103(36):13271–13275. doi: 10.1073/pnas.0602203103

Table 2.

Sex ratios at birth, by birth order: China and South Korea

Year Total Birth order
1 2 3 4 5+
China
1981 108 105 107 113 115 109
1989 114 105 120 125 133 130
2001 116 106 124 128 131
    Urban 116 113 130 119 119
    Rural 115 105 123 129 132
South Korea
1980 104 106 104 103 99
1989 112 104 113 185 209
1992 114 106 113 196 229
2001 108 106 108 120 128

Adapted from refs. 27 and 61.