Table 4.
Predictors of Respiratory Syncytial Virus Illness by Case/Control Status
| Characteristic | RSV Cases (n = 146) | Sick Controls (n = 190) | P Value | Healthy Controls (n = 260) | P Value |
|---|---|---|---|---|---|
| Maternal characteristics | |||||
| Influenza vaccine arm, No. (%) | 82 (56) | 101 (53) | .66 | 131 (50) | .30 |
| Parity, median (IQR) | 3 (1–4) | 3 (1–4) | .07 | 3 (2–5) | .03 |
| Wealth indexa, mean (SD) | 0.65 (3.5) | –0.09 (3.5) | .04 | 0.52 (3.9) | .47 |
| Less than primary education, No. (%) | 120 (82) | 156 (82) | .93 | 203 (78) | .37 |
| Primary or more education, No. (%) | 26 (18) | 34 (18) | 57 (22) | ||
| Household crowding, people/room, mean (SD) | 2.8 (2.1) | 2.8 (1.7) | .46 | 2.8 (1.5) | .41 |
| Age, y, mean (SD) | 25.6 (6.2) | 24.9 (5.9) | .36 | 24.0 (5.9) | .02 |
| Infant characteristics | |||||
| Male sex, No. (%) | 71 (49) | 101 (53) | .44 | 128 (49) | .92 |
| Gestational age, wk, mean (SD) | 39.9 (2.2) | 39.4 (2.3) | .06 | 39.7 (2.3) | .31 |
| Birth weight, g, mean (SD) | 3124 (476) | 3063 (453) | .40 | 3070 (431) | .70 |
P value for comparing controls to cases using Wilcoxon test for continuous variables and χ2 test for categorical variables.
Abbreviations: IQR, interquartile range; RSV, respiratory syncytial virus; SD, standard deviation.
aWealth index calculated using principal components analysis to have a population mean = 0.0 (SD, 3.6).