Baseline characteristics for families in intervention and control groups
| Variable | Control group (n=401) | Intervention group (n=361) | P value | ||
| Median* | IQR | Median* | IQR | ||
| Child age (months) | 4.6 [4] | 3.1–6.0 | 4.6 [7] | 3.1–6.2 | 0.90 |
| Child gender (% male) | 191 (48.2%) [5] | 181 (50.4%) [2] | 0.55 | ||
| Number of children (under 16) living in household | 2 [2] | 1–2 | 2 [3] | 1–3 | 0.047 |
| Maternal age at birth of first child | 27 [34] | 21–31 | 25 [19] | 20–29 | 0.001 |
| Proportion of families with one adult per household | 61 (15.3%) [3] | 96 (26.7%) [1] | 0.001 | ||
| Index of Multiple Deprivation (IMD) 2019 | 34.3 [6] | 24.7–40.5 | 52.69 [9] | 45.9–57.3 | 0.001 |
| Distance to the nearest emergency department (km)† | 4.86 [2] | 3.74–5.78 | 4.24 [6] | 3.74–6.10 | 0.074 |
[ ] denotes missing values.
*Unless otherwise specified.
†Direct distances (not road distances) from participants’ home postcodes to the nearest emergency department were calculated using https://www.doogal.co.uk/DrivingDistances.php