Table 4.
Relative risks (95% CI) for CPa by low birthweight categories (reference category = birthweight ≥2500 g) by surveillance year, overall and by race/ethnicity
| Surveillance year 2006 (birth year 1998) Relative risk (95% CI) | Surveillance year 2008 (birth year 2000) Relative risk (95% CI) | Surveillance year 2010 (birth year 2002) Relative risk (95% CI) | |
|---|---|---|---|
| Overall | |||
| ≥2500 g | 1.0 (reference) | 1.0 (reference) | 1.0 (reference) |
| LBWb | 13.9 (11.0, 17.4) | 11.5 (9.2, 14.4) | 10.8 (8.5, 13.7) |
| VLBWc | 39.1 (30.9, 49.5) | 34.2 (26.9, 43.4) | 28.6 (22.0, 37.2) |
| Boys | |||
| ≥2500 g | 1.0 (reference) | 1.0 (reference) | 1.0 (reference) |
| LBW | 13.9 (10.2, 19.0) | 13.3 (9.9, 17.7) | 11.0 (7.9, 15.2) |
| VLBW | 39.5 (28.7, 54.5) | 33.4 (24.6, 45.3) | 32.7 (23.0, 46.6) |
| Girls | |||
| ≥2500 g | 1.0 (reference) | 1.0 (reference) | 1.0 (reference) |
| LBW | 14.1 (10.0, 19.9) | 10.0 (6.7, 14.0) | 10.8 (7.6, 15.3) |
| VLBW | 39.1 (27.7, 55.4) | 35.6 (24.2, 52.3) | 24.8 (16.8, 36.8) |
| White non-Hispanic | |||
| ≥2500 g | 1.0 (reference) | 1.0 (reference) | 1.0 (reference) |
| LBW | 13.3 (9.8, 18.1) | 11.2 (8.1, 15.5) | 10.1 (7.0, 14.6) |
| VLBW | 32.1 (22.3, 46.1) | 31.0 (21.3, 45.1) | 25.5 (16.3, 40.0) |
| Black non-Hispanic | |||
| ≥2500 g | 1.0 (reference) | 1.0 (reference) | 1.0 (reference) |
| LBW | 13.4 (9.0, 20.2) | 10.2 (7.0, 14.9) | 10.3 (7.0, 15.0) |
| VLBW | 43.3 (29.7, 63.4) | 29.9 (20.7, 43.3) | 27.1 (18.6, 39.5) |
| Hispanic | |||
| ≥2500 g | 1.0 (reference) | 1.0 (reference) | 1.0 (reference) |
| LBW | 59.6 (16.5, 215.5) | 13.5 (6.2, 29.6) | 10.8 (4.9, 24.0) |
| VLBW | 188.4 (63.8, 556.6) | 54.1 (23.4, 125.2) | 24.5 (8.5, 69.6) |
CI, confidence interval; LBW, low birthweight (<2500 g); VLBW, very low birthweight (<1500 g).
a
CP cases restricted to those not attributed to a postneonatal cause.
b
P-value = 0.136 for the difference between the relative risk in 2006 and 2010.
c
P-value = 0.082 for the difference between the relative risk in 2006 and 2010.