Characteristics of study and control children
| Screaming/crying | Control children | |
|---|---|---|
| Male (%) | 238 (52.9) | 238 (52.9) |
| Female (%) | 212 (47.1) | 212 (47.1) |
| Mean age at presentation (SD) | 5.5 months (4.6 months) | 5.5 months (4.6 months) |
| Median age at presentation | 3.6 months | 3.7 months |
| Male presentation age (SD) | 5.6 months (4.5 months) | 5.5 months (4.5 months) |
| Female presentation age (SD) | 5.5 months (4.6 months) | 5.6 months (4.6 months) |