Table 1. The overall and subgroup of selected variables among PUD patients in different seasons.
| Overall | Spring | Summer | Fall | Winter | P value | |
| Overall | 13 022 | 3317 (25.47) | 3143 (24.14) | 3072 (23.59) | 3490 (26.8) | |
| Gender | ||||||
| Male | 8392 (64.44) | 2146 (25.57) | 2035 (24.25) | 1959 (23.34) | 2252 (26.84) | 0.8391 |
| Female | 4630 (35.56) | 1171 (25.29) | 1108 (23.93) | 1113 (24.04) | 1238 (26.74) | |
| Age | ||||||
| <65 | 5273 (40.49) | 1342 (25.45) | 1299 (24.63) | 1250 (23.71) | 1382 (26.21) | 0.5473 |
| ≥65 | 7749 (59.51) | 1975 (25.49) | 1844 (23.8) | 1822 (23.51) | 2108 (27.2) | |
| PUD type | ||||||
| GU | 7306 (56.11) | 1822 (24.94) | 1814 (24.83) | 1750 (23.95) | 1920 (26.28) | 0.0816 |
| DU | 4720 (36.25) | 1256 (26.61) | 1090 (23.09) | 1078 (22.84) | 1296 (27.46) | |
| Others | 996 (7.65) | 239(24) | 239(24) | 244 (24.5) | 274 (27.51) | |
| Area | ||||||
| North | 4953 (38.04) | 1269 (25.62) | 1175 (23.72) | 1159 (23.4) | 1350 (27.26) | 0.6972 |
| Central | 3244 (24.91) | 825 (25.43) | 791 (24.38) | 792 (24.41) | 836 (25.77) | |
| South | 4292 (32.96) | 1086 (25.3) | 1056 (24.6) | 1010 (23.53) | 1140 (26.56) | |
| East | 472 (3.62) | 121 (25.64) | 107 (22.67) | 99 (20.97) | 145 (30.72) | |
| Others | 61 (0.47) | 16 (26.23) | 14 (22.95) | 12 (19.67) | 19 (31.15) | |
| NSAIDs use | ||||||
| Non-NSAIDs users | 4065 (31.22) | 1049 (25.81) | 941 (23.15) | 909 (22.36) | 1166 (28.68) | 0.0194 |
| NSAIDs users (non-long term) | 5111 (39.25) | 1304 (25.51) | 1239 (24.24) | 1242 (24.3) | 1326 (25.94) | |
| NSAIDs users (long term) | 3846 (29.53) | 964 (25.07) | 963 (25.04) | 921 (23.95) | 998 (25.95) |
DUduodenal ulcerGUgastric ulcerNSAIDsnon-steroidal anti-inflammatory drugsPUDpeptic ulcer disease