Table 5.
Descriptive variable means in preterm/term births with/without maternal medical problems.a
| Descriptive variable | SPTB n=509 (10.5%) | IPTB n=225 (4.7%) | STB n=4099 (84.8%) | |||
|---|---|---|---|---|---|---|
| All, including medical problems | All, excluding medical problems (n=450, 88.4%) | All, including medical problems | All, excluding medical problems (n=111, 49.3%) | All, including medical problems | All, excluding medical problems (n=3678, 89.7%) | |
| Gestational age at enrollment (days) | 144.8 | 146.6 | 130.7 | 133.4 | 144.0 | 144.5 |
| Maternal age (years) | 24.6 | 24.5 | 25.3 | 25.2 | 24.3 | 24.4 |
| Maternal weight (kg) | 59.5 | 58.7 | 64 | 61.3 | 63.8 | 63.6 |
| Maternal length (cm) | 158 | 158 | 158 | 158 | 159 | 159 |
| Maternal head circumference (mm) | 542 | 542 | 545 | 543 | 545 | 544 |
| Maternal mid upper arm circumference (mm) | 262.5 | 259.7 | 277.1 | 268.7 | 273.4 | 272.6 |
| BMI (kg/m2) | 23.9 | 23.6 | 25.8 | 24.5 | 25.3 | 25.2 |
| Gravidity | 2.3 | 2.3 | 2.2 | 2.4 | 2.1 | 2.1 |
| Maternal education years | 9.6 | 9.6 | 10.0 | 9.8 | 10.0 | 10.0 |
| Household income (Randsb) | 802.4 | 796.5 | 925.6 | 909.1 | 853.1 | 850.0 |
| Edinburgh Depression Scorec | 13.6 | 13.6 | 12.9 | 12.7 | 12.9 | 12.9 |
| Daily cigarettes | 4.7 | 4.6 | 4.7 | 4.7 | 4.3 | 4.3 |
| Birth weight (g) | 2244.1 | 2249.1 | 1954.6 | 2015.3 | 3097.2 | 3097.3 |
| Birth weight Z-score | −0.3 | −0.3 | −0.7 | −0.65 | −0.4 | −0.4 |
| Birth weight centile | 42.8 | 42.9 | 30.8 | 34.47 | 38.9 | 38.8 |
| Days kept in hospital | 5.5 | 5.5 | 10.6 | 6.7 | 0.9 | 0.8 |
Abbreviations: BMI, body mass index; IPTB, induced preterm birth; SPTB, spontaneous preterm birth; STB, spontaneous term birth.
a
Values are given as the mean.
b
1 USD = 15.22 Rands.
c
Validated.