Population and distance of referring cities
| Population of city | < 1 million | 1–10 million | >10 million |
| Number of patients | 15 (29.4%) | 6 (11.8%) | 30 (58.8%) |
| Age at presentation (months) | 9.8±7.8 (2–30) | 13.8±12.6 (5–36) | 8.8±7.4 (1.5–30) |
| Distance of city from Lahore | < 100 km | 100–250 km | >250 km |
| Number of patients | 33 (64.7%) | 9 (17.6%) | 9 (17.6%) |
| Age at presentation (months) | 8.8±7.8 (1.5–30) | 11.1±9.9 (2–36) | 10.4±7.7 (2–30) |