Baseline characteristics of enrolled subjects
| Variable | Category | Measles group (n=2228) | Non-measles group (n=19 930) | P value | ||
| Mean±SD or N (%) | Median (IQR) | Mean±SD or N (%) | Median (IQR) | |||
| Age at case diagnosis | 3.06±3.04 | 2 (1–4) | 3.16±3.01 | 2 (1–4) | 0.1264 | |
| Person time (days) | 1379.9±595.33 | 1826 (849–1826) | 1358.7±611.54 | 1826 (804–1826) | 0. 1186 | |
| Sex | Female | 1038 (46.59) | 9275 (46.54) | 0.9643 | ||
| Region | England | 1816 (81.51) | 16 291 (81.74) | 0.9871 | ||
| Northern Ireland | 52 (2.33) | 448 (2.25) | ||||
| Scotland | 167 (7.50) | 1497 (7.51) | ||||
| Wales | 193 (8.66) | 1695 (8.50) | ||||
| Experience of an excluding event during follow-up | 125 (5.61) | 898 (4.51) | 0.0219 | |||
| History of respiratory disease | 84 (3.77) | 737 (3.70) | 0.8592 | |||
| History of cardiovascular disease | 18 (0.81) | 124 (0.62) | 0.3249 | |||
| Townsend deprivation score | 0 | 108 (4.85) | 1001 (5.02) | 0.1696 | ||
| 1 | 482 (21.63) | 4553 (22.84) | ||||
| 2 | 409 (18.36) | 3483 (17.48) | ||||
| 3 | 422 (18.94) | 3947 (19.80) | ||||
| 4 | 426 (19.12) | 3727 (18.70) | ||||
| 5 | 381 (17.10) | 3198 (16.05) | ||||
| Missing | 0 (0.00) | 21 (0.11) | ||||
| Vaccine non-adherence | Yes | 43 (1.93) | 29 (0.15) | <0.0001 | ||
| Measles vaccination before index date | 1212 (54.40) | 19 930 (100.00) | <0.0001 | |||
| Measles vaccination ever during observation | 2044 (91.74) | 19 930 (100.00) | <0.0001 | |||
| # Consults in the year before Index (continuous) | 13.87±11.54 | 11 (6–19) | 13.22±13.80 | 10 (5–17) | <0.0001 | |
| # Consults in the year before Index (categorical) | 0–3 | 300 (13.46) | 3731 (18.72) | <0.0001 | ||
| 4–7 | 427 (19.17) | 4193 (21.04) | ||||
| 8–11 | 443 (19.88) | 3546 (17.79) | ||||
| 12–19 | 542 (24.33) | 4406 (22.11) | ||||
| >19 | 516 (23.16) | 4054 (20.34) | ||||
| Infections in the year prior to index | 0.86±1.27 | 1 (0–2) | 0.87±1.58 | 1 (0–2) | 0.7782 | |
| Anti-infectives in the year prior to index | 1.58±1.97 | 0 (0–1) | 1.53±2.41 | 0 (0–1) | 0.2708 | |
| Hospitalisations in the year prior to index | 0.11±0.51 | 0 (0–0) | 0.07±0.41 | 0 (0–0) | 0.0004 | |
P values lower than 0.05 are shown in bold.