Table 1 Data summary.
|  | Hochiminh city (N visits = 50648) | Hanoi (N visits = 136650) | Haiphong (N visits = 14865) | Total (N visits = 202163) | p value* |
|---|---|---|---|---|---|
Number of children | 15,305 | 69,215 | 4364 | 88,884 | Â |
Age (median (IQR)) | 8.9 (6.0, 12.1) | 7.9 (5.1, 11.3) | 9.0 (5.9, 12.1) | 8.2 (5.3, 11.6) | < 0.001 |
− 18 months ≤ age ≤ 5 years | 9226 (18.2%) | 33,856 (24.8%) | 2750 (18.5%) | 45,832 (22.7%) |  |
− 5 years < age ≤ 11 years | 24,903 (49.2%) | 66,144 (48.4%) | 7134 (48.0%) | 98,181 (48.6%) |  |
− 11 years < age ≤ 18 years | 16,519 (32.6%) | 36,650 (26.8%) | 4981 (33.5%) | 58,150 (28.8%) |  |
Sex Male | 25,283 (49.9%) | 72,077 (52.7%) | 7938 (53.4%) | 105,298 (52.1%) | < 0.001 |
Calendar year |  |  |  |  | < 0.001 |
− 2018 | 3694 (7.3%) | 2616 (1.9%) | 605 (4.1%) | 6915 (3.4%) |  |
− 2019 | 6109 (12.1%) | 20,890 (15.3%) | 1108 (7.5%) | 28,107 (13.9%) |  |
− 2020 | 5917 (11.7%) | 23,208 (17.0%) | 2169 (14.6%) | 31,294 (15.5%) |  |
− 2022 | 13,361 (26.4%) | 28,999 (21.2%) | 4522 (30.4%) | 46,882 (23.2%) |  |
− 2023 | 10,118 (20.0%) | 30,520 (22.3%) | 3237 (21.8%) | 43,875 (21.7%) |  |
− 2024 | 11,449 (22.6%) | 30,417 (22.3%) | 3224 (21.7%) | 45,090 (22.3%) |  |
