Gestational age category | |||||
---|---|---|---|---|---|
20–28 wk** | 29–32 wk | 33–36 wk | |||
Year | NZDep decile | All preterm OR* | (n=2693) OR* | (n=12669) OR* | (n=36266) OR* |
Multivariate analysis adjusted for gender, maternal age, parity, birth year, decile and birt , decile*age, decile*parity. | |||||
*Odds ratio with reference category Deprivation Index decile 1, 1980. | |||||
*Odds ratios for the 20–28 week category did not reach statistical significance. | |||||
1980 | 1 | 1.00 | 1.00 | 1.00 | 1.00 |
1980 | 5 | 1.26 | 1.12 | 1.25 | 1.19 |
1980 | 10 | 1.67 | 1.28 | 1.66 | 1.48 |
1990 | 1 | 1.19 | 1.58 | 1.19 | 1.17 |
1990 | 5 | 1.43 | 1.82 | 1.42 | 1.32 |
1990 | 10 | 1.79 | 2.17 | 1.76 | 1.55 |
1999 | 1 | 1.40 | 2.39 | 1.40 | 1.34 |
1999 | 5 | 1.61 | 2.83 | 1.58 | 1.45 |
1999 | 10 | 1.91 | 3.48 | 1.85 | 1.60 |