Table 1 Demographic characteristics for case and control groups.

From: Interaction between CYP1A1/CYP17A1 polymorphisms and parental risk factors in the risk of hypospadias in a Chinese population

Characteristics

Cases (N = 152)%

Controls (N = 151)%

Infant characteristics

Year of birth

  

  <2008

31 (20.4%)

30 (19.9%)

  2008–2010

54 (35.5%)

42 (27.8%)

  2011–2013

32 (21.1%)

64 (42.4%)

  >2013

35 (23.0%)

15 (9.9%)

Maternal characteristics

Age at delivery

  <25 years

36 (23.7%)

38 (25.2%)

  25–29 years

57 (37.5%)

59 (39.1%)

  30–34 years

42 (27.6%)

45 (29.8%)

  ≥35 years

17 (11.2%)

9 (6.0%)

Residence

  Rural

55 (36.2%)

45 (29.8%)

  Urban

97 (63.8%)

106 (70.2%)

Educational level

  Junior high

36 (23.7%)

26 (17.2%)

  Senior high

58 (38.1%)

38 (25.2%)

  Undergraduate

38 (25.0%)

47 (31.1%)

  Postgraduate

20 (13.2%)

40 (26.5%)

Pre-pregnancy BMI

  Underweight (<18.5 kg/m2)

32 (21.1%)

16 (10.6%)

  Normal (18.5–24.9 kg/m2)

99 (71.9%)

119 (78.8%)

  Overweight (25.0–29.9 kg/m2)

17 (11.2%)

15 (9.9%)

  Obese (≥30 kg/m2)

4 (2.6%)

1 (0.7%)