Farhud D D, Kamali M S, Marzban M
Anthropol Anz. 1986 Jun;44(2):137-41.
616,638 births during 1967-1983 from a maternity hospital in Tehran (Iran) have been considered for the present study. The mean rate of normal delivery was 92.59%, that of Caesarean was 3.09%, that of wantose was 1.52% and finally that of forceps was 1.31%. Caesarean and wantose (vacuum extractor) delivery types showed an increasing trend, whereas the normal and forceps delivery types showed a decreased trend during the period under study. The secondary sex ratio was the highest in 1977 and the lowest in 1983 with a mean of 105.18. The twinning rate showed a decreasing trend during the above period.
本研究纳入了1967年至1983年期间伊朗德黑兰一家妇产医院的616,638例分娩数据。正常分娩的平均比例为92.59%，剖宫产为3.09%，胎头吸引术为1.52%，产钳助产为1.31%。在研究期间，剖宫产和胎头吸引术（真空吸引器）分娩类型呈上升趋势，而正常分娩和产钳助产分娩类型呈下降趋势。出生性别比在1977年最高，1983年最低，平均为105.18。在此期间，双胎率呈下降趋势。
