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 | 22 | 18.5% | 97 | 119 | PR = 2.71 |
Never | 18 | 6.8% | 246 | 264 | M-H weight = 5.59 |
All | 40 | 10.4% | 343 | 383 | |
Combined strata: Normal and low birth weight | |||||
Underweight | Normal | All | Exp. prev. = 22.8% | ||
N | Prev. | N | N | PR (crude) = 3.17 | |
Ever in hospital | 30 | 10.3% | 260 | 290 | PR (M-H) = 2.61 |
Never | 32 | 3.3% | 950 | 982 | Confounding = -17.8% |
All | 62 | 4.9% | 1210 | 1272 | P-value(het)*= 0.8 |