Table 1 Characteristics of the mothers (n = 1256) in the study cohort
From: Impact of BMI and smoking in adolescence and at the start of pregnancy on birth weight
Variables | Mean (SD)/percentage | n | ||
|---|---|---|---|---|
Birth weight (kg) | 3.46 (0.52) | 1047 | ||
Birth length (cm) | 50.1 (2.3) | 706 | ||
Age at start of first pregnancy | 27.6 (4.6) | 1256 | ||
Disposable Incomea | 167 200 (85 500) | 1256 | ||
Low (< median 146 800) | 49.9% | 627 | ||
High (> median 146 800) | 50.1% | 629 | ||
Education levelb | 1227 | |||
Low (0–12 years) | 58.6% | 719 | ||
High (> 12 years) | 41.4% | 508 | ||
Parental Country of Birth | 1223 | |||
Sweden | 72.5% | 887 | ||
Other | 27.5% | 336 | ||
19 years | Pregnancy start | |||
Weight (kg) mean (SD) | 59.9 (9.1) | 65.1 (11.0) | 1227 | 1030 |
Height (cm) mean (SD) | 167.1 (6.0) | 1245 | ||
BMI (kg/m2) mean (SD) | 21.4 (2.8) | 23.3 (3.6) | 1225 | 1030 |
Underweight (< 18.5) | 7.9% | 4.8% | 97 | 49 |
Normal (18.5–24.9) | 84.4% | 69.9% | 1043 | 720 |
Overweight (25–29.9) | 6.3% | 20.0% | 77 | 206 |
Obese (> 30) | 1.4% | 5.3% | 17 | 55 |
Smoking status | 1233 | 1181 | ||
Smoker | 35.8% | 14.7% | 441 | 174 |