Table 1. Descriptive data for the matching variables and other background characteristics among 237 children from the Southern part of Sweden with hypospadias (cases) and 237 matched controls.
| Cases | Controls | |||
| n | (%) | N | (%) | |
| Matching variables | ||||
| Birth weight | ||||
| 1986–1987 | 18 | (8) | 18 | (8) |
| 1988–1993 | 73 | (31) | 74 | (31) |
| 1994–1998 | 65 | (27) | 62 | (26) |
| 1999–2002 | 81 | (34) | 83 | (35) |
| Maternal age (years) | ||||
| <25 | 50 | (21) | 50 | (21) |
| 25–29 | 91 | (38) | 92 | (39) |
| 30–34 | 61 | (26) | 60 | (25) |
| >35 | 35 | (15) | 35 | (15) |
| Parity | ||||
| 1 | 120 | (51) | 119 | (50) |
| 2 | 77 | (32) | 76 | (32) |
| >2 | 40 | (17) | 42 | (18) |
| Maternal smoking in early pregnancya | ||||
| No | 180 | (81) | 183 | (82) |
| Yes | 42 | (19) | 41 | (18) |
| Unknown | 15 | 13 | ||
| Other variables | ||||
| Gestational age (weeks) | ||||
| <37 | 24 | (10) | 14 | (6) |
| 37–38 | 45 | (19) | 39 | (16) |
| 39–40 | 114 | (48) | 122 | (52) |
| >40 | 54 | (23) | 62 | (26) |
| Birth weightb (g) | ||||
| <2500 | 21 | (9) | 9 | (4) |
| >4000 | 38 | (16) | 43 | (18) |
| Family situationc | ||||
| Cohabiting with the father | 213 | (94) | 207 | (92) |
| Else | 14 | (6) | 17 | (7) |
| Working status in early pregnancyd | ||||
| Full time | 104 | (51) | 106 | (52) |
| Part time | 52 | (26) | 66 | (32) |
| Not working | 47 | (23) | 34 | (16) |
| Caesarean section | 32 | (14) | 30 | (13) |
a
Data missing for 15 cases and 13 controls;
b
Data missing for 2 cases and 2 controls;
c
Data missing for 10 cases and 13 controls;
d
Data missing for 34 cases and 31 controls.