Table 1.
Basic characteristics and SARS-CoV-2 PCR result of nightlife and non-nightlife groups before and after matchinga
| Before matching | After matching | |||||||
|---|---|---|---|---|---|---|---|---|
| Nightlife (n = 196) | Non-nightlife (n = 1321) | Standardised mean difference | P valueb | Nightlife (n = 196) | Non-nightlife (n = 196) | Standardised mean difference | P valueb | |
| Age, years | 31 (25–38) | 39 (29–51) | 0.61 | <0.001 | 31 (25–38) | 32 (25–41) | 0.0088 | 0.617 |
| Sex | 0.46 | <0.001 | 0.012 | 1.0 | ||||
| Male | 146 (74.5) | 721 (54.6) | 146 (74.5) | 146 (74.5) | ||||
| Female | 50 (25.5) | 600 (45.4) | 50 (25.5) | 50 (25.5) | ||||
| Nationality | 0.19 | 0.044 | 0.023 | 0.415 | ||||
| Japanese | 186 (94.9) | 1196 (90.5) | 186 (94.9) | 186 (94.9) | ||||
| Non-Japanese | 10 (5.1) | 125 (9.5) | 10 (5.1) | 10 (5.1) | ||||
| Comorbidity | 22 (11.2) | 228 (17.3) | 0.19 | 0.039 | 22 (11.2) | 20 (10.2) | 0.032 | 1.0 |
| Severity | 0.058 | 0.368 | 0.051 | 0.368 | ||||
| Asymptomatic | 0 (0.0) | 21 (1.6) | 0 (0.0) | 0 (0.0) | ||||
| Mild | 188 (95.9) | 1262 (95.5) | 188 (95.9) | 189 (96.4) | ||||
| Severe | 8 (4.1) | 38 (2.9) | 8 (4.1) | 7 (3.6) | ||||
| Day of illness | 6 (5–8) | 7 (4–11) | 0.43 | 0.200 | 6 (5–8) | 6 (5–8) | 0.097 | 0.136 |
| Exposure to confirmed cases | 52 (26.5) | 144 (10.9) | 0.37 | <0.001 | 52 (26.5) | 43 (21.9) | 0.046 | 0.436 |
| Overseas travel | 3 (1.5) | 74 (5.6) | 0.33 | 0.013 | 3 (1.5) | 1 (0.5) | 0.083 | 1.0 |
| Healthcare work | 6 (3.1) | 124 (9.4) | 0.37 | 0.002 | 6 (3.1) | 3 (1.5) | 0.030 | 1.0 |
| SARS-CoV-2 PCR positive | 125 (63.8) | 207 (15.7) | <0.001 | 125 (63.8) | 45 (23.0) | <0.001 | ||
PCR, polymerase chain reaction; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
a
Median (interquartile range) for continuous variables, number (%) for categorical variables.
b
Mann–Whitney U test for continuous variables, Fisher's exact test or Kruskal−Wallis test for categorical variables.