| Total N = 20,174 | < 6 m N = 9291 | 6 m-1y N = 3519 | 1y-2y N = 3309 | 2y-6y N = 4055 | P |
---|---|---|---|---|---|---|
Gender (male) n(%) | 13,165 (65.26) | 6267 (67.45) | 2458 (69.87) | 2145 (64.82) | 2295 (56.61) | <  0.0001 |
Symptoms on admission | ||||||
 Cough | 17,907 (88.76) | 8069 (86.85) | 3199 (90.91) | 2940 (88.85) | 3699 (91.22) | <  0.0001 |
 Fever | 8767 (43.46) | 1668 (17.95) | 1850 (52.57) | 2211 (66.82) | 3038 (74.92) | <  0.0001 |
 Wheezing | 2962 (14.68) | 1352 (14.55) | 825 (23.44) | 469 (14.17) | 316 (7.79) | <  0.0001 |
 Breathless | 99 (0.49) | 69 (0.74) | 13 (0.37) | 11 (0.33) | 6 (0.15) | <  0.0001 |
 Cyanosis | 352 (1.74) | 308 (3.32) | 22 (0.63) | 18 (0.54) | 4 (0.10) | <  0.0001 |
X-ray Manifestation | ||||||
 Normal | 3769 (27.66) | 1483 (23.34) | 758 (32.84) | 627 (29.10) | 901 (32.05) | <  0.0001 |
 Pneumonia | 8939 (65.59) | 4401 (69.26) | 1421 (61.57) | 1413 (65.57) | 1704 (60.62) | |
 Others | 920 (6.75) | 470 (7.40) | 129 (5.59) | 115 (5.34) | 206 (7.33) | |
CHD n(%) | 2729 (13.53) | 2172 (23.38) | 320 (9.09) | 152 (4.59) | 85 (2.10) | <  0.0001 |
History of pneumonia n(%) | 2757 (13.67) | 947 (10.19) | 634 (18.02) | 539 (16.29) | 637 (15.71) | <  0.0001 |
Severe pneumonia n(%) | 3309 (16.40) | 2187 (23.54) | 377 (10.71) | 353 (10.67) | 392 (9.67) | < 0.0001 |
Had complications n(%) | 10,434 (51.72) | 4962 (53.41) | 1839 (52.26) | 1724 (52.10) | 1909 (47.08) | < 0.0001 |
Treatment | ||||||
 ICU admission | 2824 (14.00) | 1949 (20.98) | 319 (9.07) | 282 (8.52) | 274 (6.76) | < 0.0001 |
 Mechanical ventilation | 378 (14.83) | 229 (13.05) | 47 (16.97) | 42 (16.15) | 60 (23.35) | < 0.0001 |