Family income*/RSP | Preterm birth | Crude rate ratio | 95% CI | P value | Adjusted rate ratio‡ | 95% CI | P value | |
---|---|---|---|---|---|---|---|---|
Number† Rate (%)† | ||||||||
Preterm birth <37 weeks | ||||||||
<$4,430 | 780 | 6.1 | 1.11 | 1.01-1.21 | 0.03 | 1.01 | 0.88-1.16 | 0.87 |
$4,430-$6,529 | 800 | 6.2 | 1.12 | 1.02-1.22 | 0.02 | 1.03 | 0.90-1.18 | 0.69 |
$6,530-$11,914 | 1,390 | 5.4 | 0.97 | 0.90-1.05 | 0.47 | 0.96 | 0.86-1.07 | 0.44 |
$11,915-$17,584 | 1,270 | 5.1 | 0.90 | 0.83-0.97 | 0.007 | 0.97 | 0.87-1.07 | 0.52 |
$17,585-$24,949 | 1,390 | 5.5 | 0.98 | 0.91-1.06 | 0.61 | 1.07 | 0.97-1.17 | 0.17 |
$ ≥ 29,450 | 1,380 | 5.6 | 1.00 | - | - | 1.00 | - | - |
RSP (no) | 5,240 | 5.7 | 1.11 | 1.05-1.18 | 0.0001 | 1.08 | 1.00-1.16 | 0.06 |
RSP (yes) | 1,780 | 5.1 | 1.00 | - | - | 1.00 | - | - |
Preterm birth <32 weeks | ||||||||
<$4,430 | 100 | 0.86 | 1.14 | 0.90-1.43 | 0.29 | 0.74 | 0.50-1.10 | 0.14 |
$4,430-$6,529 | 110 | 0.92 | 1.21 | 0.96-1.52 | 0.11 | 0.87 | 0.59-1.28 | 0.47 |
$6,530-$11,914 | 190 | 0.79 | 1.04 | 0.85-1.26 | 0.72 | 0.82 | 0.60-1.11 | 0.19 |
$11,915-$17,584 | 170 | 0.75 | 0.98 | 0.80-1.20 | 0.86 | 0.90 | 0.68-1.18 | 0.44 |
$17,585-$24,949 | 170 | 0.72 | 0.95 | 0.78-1.16 | 0.62 | 0.92 | 0.72-1.19 | 0.52 |
$ ≥ 29,450 | 150 | 0.76 | 1.00 | - | - | 1.00 | - | - |
RSP (no) | 670 | 0.81 | 1.18 | 1.02-1.37 | 0.02 | 1.17 | 0.94-1.44 | 0.15 |
RSP (yes) | 210 | 0.69 | 1.00 | - | - | 1.00 | - | - |