Table 1: Characteristics of Case and Control Mothers with or without Human Chorionic Gonadotropin (hCG) Treatment During the Second and/or Third Month of Gestation

Maternal Variables Case Mothers Control Mothers Comparison between Treated Case and Control Mothers
Untreated(N=22,760) Treated(N=83) Untreated(N=38,054) Treated(N=97)
No. % No. % No. % No. %
Quantitative
Maternal age (yr) 24 or less 10,293 45.2 22 26.5 17,961 47.2 33 34.0
25-29 7,750 34.1 34 41.0 12,846 33.8 39 40.2 X22=1.5 p=0.46
30 or more 4,717 20.7 27 32.5 7,247 19.0 25 25.8
Mean±S.D. 25.4±5.3 27.4±4.7 25.4±4.9 26.8±4.6 t=0.9 p=0.36
Birth order 1 10,650 46.8 58 69.9 18,141 47.7 68 70.1 X 21=0.0 p=0.97
2 or more 12,110 53.2 25 30.1 19,913 52.3 29 29.9
Mean±S.D. 1.9±1.1 1.4±0.8 1.8±0.9 1.4±0.6 t=0.9 p=0.90
Pregnancy order 1 9,741 42.8 32 38.6 16,325 42.9 36 37.1 X 21=0.04 p=0.84
2 or more 13,019 57.2 51 61.4 21,729 57.1 61 62.9
Mean±S.D. 2.1±1.4 2.3±1.6 2.0±1.2 2.1±1.2 t= 1.0 p=0.96
Categorical Unmarried 1,265 5.6 4 4.8 1,470 3.9 1 1.0 X 26=4.0 p=0.68
Employment status Professional 1,881 8.3 20 24.1 4,330 11.4 23 23.7
Managerial 4,945 21.7 23 27.7 10,104 26.6 30 30.9
Skilled worker 6,308 27.7 21 25.3 11,660 30.6 30 30.9
Semiskilled worker 3,857 17.0 12 14.5 5,774 15.2 9 9.3
Unskilled worker 1,502 6.6 1 1.2 1,859 4.9 0 0.0
Housewife 2,124 9.3 4 4.8 2,036 5.4 2 2.1
Others 2,143 9.4 2 2.4 2,291 6.0 3 3.1