Table 3 Contact history and frequency of outdoor activities among participants 14 days before returning to Macao

 Went to any hospitals or clinics for any reason (Yes, %)

56/1137 (4.93%)

53/1113 (4.76%)

3/24 (12.5%)

0.110

 Went to hospitals or clinics for respiratory symptoms (Yes, %)

20/1137 (1.76%)

18/1113 (1.62%)

2/24 (8.33%)

0.064

 Had physical contact with anyone who had respiratory symptoms (Yes, %)

91/1137 (8%)

85/1113 (7.64%)

6/24 (25%)

0.002

  If yes, did you wear a mask during your contact (Yes, %)

58/91 (63.74%)

57/85 (67.06%)

1/6 (16.67%)

0.022

  If yes, did you wash your hands after your contact (Yes, %)

84/91 (92.31%)

81/85 (95.29%)

3/6 (50%)

0.005

 Had physical contact with suspected/confirmed COVID-19 patients (including family members) (Yes, %)

25/1137 (2.2%)

21/1113 (1.89%)

4/24 (16.67%)

0.001

  If yes, did you wear a mask during the contact (Yes, %)

13/25 (52%)

13/21 (61.9%)

0/4 (0%)

0.039

  If yes, did you wash your hands after your contact (Yes, %)

25/1137 (2.2%)

20/21 (95.24%)

2/4 (50%)

0.057

 Went to workplace (mean ± std. deviation)

0.73 ± 2.41

0.7 ± 2.4

0.8 ± 2.6

0.833

 Went to school (mean ± std. deviation)

2.32 ± 3.7

2.3 ± 3.7

3.4 ± 5.1

0.291

 Went to crowded places, such as supermarkets, malls, and cinemas (mean ± std. deviation)

2.34 ± 2.43

2.3 ± 2.4

3.8 ± 4.6

0.142

 Took public transportation vehicles, such as bus, underground transit, train, and aircraft but excluding taxi (mean ± std. deviation)

2.52 ± 4.36

2.5 ± 4.3

4.5 ± 5.7

0.110

 Participated in high-risk gathering activities defined by interacting with people within 2 m without wearing a mask such as parties, bars, restaurants, family and friend gatherings (mean ± std. deviation)

0.82 ± 2.77

0.7 ± 2.3

5.4 ± 10.1

0.034