First stratum: Normal birth weight | |||||
---|---|---|---|---|---|
Underweight | Normal | All | |||
N | Prev. | N | N | Exp. prev. = 19.2% | |
Ever in hospital | 8 | 4.7% | 163 | 171 | PR = 2.40 |
Never | 14 | 1.9% | 704 | 718 | M-H weight = 2.69 |
All | 22 | 2.5% | 867 | 889 | |
Second stratum: Low birth weight | |||||
Underweight | Normal | All | |||
N | Prev. | N | N | Exp. prev. = 31.1% | |
Ever in hospital | 16 | 13.4% | 103 | 119 | PR = 2.54 |
Never | 14 | 5.3% | 250 | 264 | M-H weight = 4.35 |
All | 30 | 7.8% | 353 | 383 | |
Combined strata: Normal and low birth weight | |||||
Underweight | Normal | All | Exp. prev. = 22.8% | ||
N | Prev. | N | N | PR (crude) = 2.90 | |
Ever in hospital | 24 | 8.3% | 266 | 290 | PR (M-H) = 2.48 |
Never | 28 | 2.9% | 954 | 982 | Confounding = -14.4% |
All | 52 | 4.1% | 1220 | 1272 | P-value(het)*= 0.9 |