Association of mortality rates in the first year of life by birth weight in infants from rural Haryana, North India
| Number of deaths (rate per 1000 live births | Number of infants† | Univariate | Multivariate‡ | PAR (%) | |
| RR (95% CI) | RR (95% CI) | ||||
| Neonatal mortality (from enrolment to 28 days) | |||||
| Total number | – | 44 975 | |||
| Birth weight (g) | |||||
| ≥2500 | 244 (7.1) | 34 317 (76.3) | Ref | Ref | – |
| <2500 | 335 (31.4) | 10 658 (23.7) | 4.42 (3.78 to 5.23) | 3.92 (3.33 to 4.66) | 41 |
| 2000–2499 | 181 (19.2) | 9403 (20.9) | 2.71 (2.27 to 3.31) | 2.56 (2.13 to 3.12)* | 24.6 |
| <2000 | 154 (122.7) | 1255 (2.8) | 17.28 (14.22 to 20.89) | 15.64 (12.90 to 19.44)* | 29.1 |
| Postneonatal mortality (29–90 days) | |||||
| Total number | – | 44 396 | |||
| Birth weight (g) | |||||
| ≥2500 | 249 (7.3) | 34 073 (76.8) | Ref | Ref | – |
| <2500 | 203 (19.7) | 10 323 (23.2) | 2.69 (2.21 to 3.19) | 2.14 (1.74 to 2.58) | 21 |
| 2000–2499 | 126 (13.7) | 9222 (20.7) | 1.88 (1.51 to 2.33) | 1.68 (1.36 to 2.08)* | 12.3 |
| <2000 | 77 (69.9) | 1101 (2.5) | 9.57 (7.32 to 12.07) | 6.43 (4.69 to 8.34)* | 11.9 |
| Postneonatal mortality (29–180 days) | |||||
| Total number | – | 44 396 | |||
| Birth weight (g) | |||||
| ≥2500 | 453 (13.3) | 34 073 (76.8) | Ref | Ref | – |
| <2500 | 350 (33.9) | 10 323 (23.2) | 2.55 (2.21 to 2.93) | 2.08 (1.77 to 2.36) | 20 |
| 2000–2499 | 249 (27.0) | 9222 (20.7) | 2.01 (1.72 to 2.34) | 1.78 (1.52 to 2.09)* | 13.9 |
| <2000 | 101 (91.7) | 1101 (2.5) | 6.89 (5.47 to 8.36) | 4.24 (3.28 to 5.37)* | 7.5 |
| Postneonatal mortality (29–365 days) | |||||
| Total number | – | 44 396 | |||
| Birth weight (g) | |||||
| ≥2500 | 725 (21.3) | 34 073 (76.8) | Ref | Ref | – |
| <2500 | 514 (49.8) | 10 323 (23.2) | 2.33 (2.07 to 2.58) | 1.92 (1.71 to 2.15) | 17.6 |
| 2000–2499 | 392 (42.5) | 9222 (20.7) | 1.99 (1.76 to 2.24) | 1.76 (1.54 to 1.99) | 13.6 |
| <2000 | 122 (110.8) | 1101 (2.5) | 5.20 (4.34 to 6.16) | 3.38 (2.71 to 4.12) | 5.6 |
*Statistical significance at p<0.05.
†Nine infants had data missing on birth weight.
‡Adjusted for place of delivery, type of delivery, multiple births, mother’s education, mother’s age, religion, caste, wealth quintiles, parity, infant sex, administration of vitamin A (intervention in the primary trial).
PAR, population attributable risk; RR, relative risk.