Table 4 Adjusted odds ratios (aOR) for preterm birth (n = 15,593), and small for gestational age (SGA) newborn (n = 13,146) associated with individual and area level characteristics (using multiple imputed data) among all singleton births (n = 330,688) during 2005-2010 in Finland
Characteristics | Preterm birth | SGA |
|---|---|---|
aOR (95% CI) | aOR (95% CI) | |
Year of birth | 1.00 (0.99-1.01) | 1.01 (1.00-1.02) |
Maternal age, years (per one year increase) | 1.02 (1.02-1.03) | 1.04 (1.03-1.04) |
Parity | ||
Nulliparous women | 1 | 1 |
Multiparous women | 0.52 (0.50-0.54) | 0.26 (0.25-0.28) |
Prior preterm birth | 5.27 (4.99-5.55) | 2.14 (1.96-2.34) |
Smoking status | ||
Non-smoking | 1 | 1 |
Quit smoking during 1st trimester | 1.03 (0.95-1.11) | 0.95 (0.87-1.03) |
Smoking after 1st trimester | 1.37 (1.30-1.43) | 2.45 (2.33-2.56) |
Socioeconomic status | ||
Upper white collar workers | 1 | 1 |
Lower white collar workers | 1.13 (1.06-1.19) | 1.18 (1.11-1.27) |
Blue collar workers | 1.20 (1.12-1.28) | 1.21 (1.13-1.31) |
Othersa | 1.09 (1.02-1.16) | 1.18 (1.10-1.27) |
Municipality derivation class b | ||
Education | ||
High (least deprived) | 1 | 1 |
Intermediate | 1.04 (0.99-1.09) | 1.02 (0.97-1.08) |
Low (most deprived) | 1.01 (0.95-1.08) | 1.04 (0.97-1.12) |
Income | ||
High (least deprived) | 1 | 1 |
Intermediate | 1.04 (0.99-1.10) | 0.94 (0.88-1.00) |
Low (most deprived) | 1.06 (0.99-1.14) | 1.00 (0.93-1.08) |
Unemployment | ||
Low (least deprived) | 1 | 1 |
Intermediate | 1.03 (0.98-1.08) | 1.07 (1.01-1.12) |
High (most deprived) | 1.04 (0.98-1.08) | 1.13 (1.06-1.20) |
Log (population) | 1.00 (0.98-1.01) | 1.01 (0.99-1.03) |