同时将出生胎次与累积生育率相比较以评价最近家庭生育的覆盖范围。
We also compared parity to cumulative fertility data to evaluate the coverage of recent household births.
方法：用临床常规的正反定型法检测abo血型，然后调查家族遗传史，胎次和出生月份，并与正常人进行比较。
Method: Using positive negative blood grouping to detect ABO blood group, and investigating family heredity, birth order, birth month, compared with normal subjects.
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