Table 1 Baseline characteristics of the morning group and the afternoon group
| Â | Mean (SD)/ N (%) | |||
|---|---|---|---|---|
Total | Morning | Afternoon | P | |
Gender | ||||
 Male | 146 (37.5) | 73 (37.4) | 73 (37.6) | 1.000 |
 Female | 243 (62.5) | 122 (62.6) | 121 (62.4) | |
Age | 62.8 (7.2) | 62.9 (7.4) | 62.7 (6.9) | 0.668 |
 50–60 years old | 191 (49.1) | 97 (49.7) | 94 (48.5) | 0.839 |
 65–75 years old | 198 (50.9) | 98 (50.3) | 100 (51.6) | |
Smoking | ||||
 No | 334 (85.9) | 168 (86.2) | 166 (85.6) | 0.972 |
 Past smoker | 14 (3.6) | 7 (3.6) | 7 (3.6) | |
 Current smoker | 41 (10.5) | 20 (10.3) | 21 (10.8) | |
Alcohol consumption | ||||
 No | 337 (86.6) | 171 (87.7) | 166 (85.6) | 0.555 |
 Yes | 52 (13.4) | 24 (12.3) | 28 (14.4) | |
Hypertension | ||||
 No | 244 (62.7) | 117 (60.0) | 127 (65.5) | 0.295 |
 Yes | 145 (37.3) | 78 (40.0) | 67 (34.5) | |
Diabetes | ||||
 No | 335 (86.1) | 161 (82.6) | 174 (89.7) | 0.056 |
 Yes | 54 (13.9) | 34 (17.4) | 20 (10.3) | |
Coronary heart disease | ||||
 No | 356 (91.5) | 179 (91.8) | 177 (91.2) | 0.858 |
 Yes | 33 (8.5) | 16 (8.2) | 17 (8.8) | |
History of Influenza vaccination | ||||
 No | 319 (82.0) | 168 (86.2) | 151 (77.8) | 0.035 |
 Yes | 70 (18.0) | 27 (13.9) | 43 (22.2) | |
Community distribution | ||||
 Shipai Street | 193 (49.6) | 100 (51.3) | 93 (47.9) | 0.543 |
 Baiyun Street | 196 (50.4) | 95 (48.7) | 101 (52.1) | |
BMI | 23.8 (3.0) | 24.1 (3.0) | 23.5 (3.0) | 0.112 |
Sleep duration(h) | 7.0 (1.4) | 7.0 (1.4) | 7.1 (1.3) | 0.617 |
EQ-5D score | 1.0 (0.0) | 1.0 (0.0) | 1.0 (0.0) | 0.444 |