Sex-selective abortions over the past four decades in China

Table 2 Number and proportion of sex-selective abortions by birth order

Year	Nssa 1	Nssa 2	Nssa 3 +	Pssa/(bf + ssa) 1	Pssa/(bf + ssa) 2	Pssa/(bf + ssa) 3 +
1982	29.09	−21.16	133.74	0.56	−0.76	3.99
1987	99.47	375.02	323.18	1.54	9.59	14.02
1990	−43.28	479.59	395.35	−0.76	12.41	16.27
2000	61.47	794.15	202.11	1.05	30.23	33.49
2005	111.02	739.22	152.59	2.22	25.99	30.66
2010	337.70	495.57	199.40	6.80	18.64	33.09
2015	149.48	211.86	190.11	3.44	6.43	28.64
2020	174.15	18.38	142.31	6.34	0.73	19.85

\(N_{ssa} {1, }N_{ssa} {\text{2, and }}N_{ssa} {3 + }\) denote the number of sex-selective induced abortions for first, second, third and above births, \(P_{{ssa/(ssa + B_{f} )}} 1, \, P_{{ssa/(ssa + B_{f} )}} 2,{\text{ and }}P_{{ssa/(ssa + B_{f} )}} 3 +\) represent the proportion of sex-selective induced abortions for first, second, third and above births to the expected number of female births

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