Males | Females | Total | |
Subjects n | 762 | 806 | 1,568 |
Age yrs | 20.3±0.9 | 20.4±0.9 | 20.3±0.9 |
Mother smoked during pregnancy | 355 (47.7)§ | 413 (52.4) | 768 (50.1) |
First-born | 372 (48.8) | 420 (52.1) | 792 (50.5) |
Birthweight g | 3383±591* | 3222±552 | 3300 (576) |
Height at birth cm | 506±28* | 498±24 | 502 (26) |
Maternal age yrs | 26.4±4.5 | 26.0±4.3 | 26.2 (4.4) |
Low maternal age (<20 yrs) | 34 (4.5)* | 21 (2.6) | 55 (3.5) |
Gestational age weeks median (range) | 40 (28–44) | 40 (29–44) | 40 (28–44) |
Breastfeeding# | 63 (8.8) | 80 (10.5) | 143 (9.6) |
Breastfeeding¶ | 125 (17.4) | 144 (18.8) | 269 (18.1) |
Bottle feeding, exclusively | 531 (73.9) | 541 (70.7) | 1072 (72.2) |
Severe respiratory tract infection+ | 125 (16.8)* | 87 (11.0) | 212 (13.8) |
Requiring doctor's consultation | 119 (16.1)* | 78 (9.9) | 197 (12.9) |
Requiring hospitalisation | 22 (3.0) | 19 (2.5) | 41 (2.7) |
Current smoking | 280 (37.0) | 278 (35.0) | 558 (36.0) |
Parent with asthma | 106 (13.9)§ | 141 (17.5) | 247 (15.8) |
Parent with allergy | 366 (48.0)* | 445 (55.2) | 811 (51.7) |
Data are presented as mean±sd, n (%) or median (range)
#: exclusively for at least 2 weeks
¶: breast feeding with additional feeding
+: in the first year of life
Significant difference between males and females (tested by Chi-squared test or t-test)
*: p<0.05
§p<0.10