. 2021 May 7;7(19):eabe2584. doi: 10.1126/sciadv.abe2584

Table 1. Number of contacts by respondent characteristics, location, and time period.

Note that reduced denominators indicate missing data. Percentages may not total 100 because of rounding. The 95% confidence interval (CI) on the mean is calculated by bootstrap sampling and are weighted by day type (i.e., weekday or weekend) for diaries during post-lockdown period. *P < 0.05, **P < 0.01, ***P < 0.001. P values are taken from a weighted negative binomial regression, with a single binary variable distinguishing the post-lockdown period from the outbreak period. The weight refers to day type (i.e., weekday and weekend).

Characteristics	Wuhan, mean (95% CI)			Shanghai, mean (95% CI)			Shenzhen, mean (95% CI)			Changsha, mean (95% CI)
Characteristics	Baseline	Outbreak	Post- lockdown	Baseline	Outbreak	Post- lockdown	Baseline	Outbreak	Post- lockdown	Baseline	Outbreak	Post- lockdown
Total number of contacts (participants)	9,114 (624)	1,245 (627)	2,751 (822)	17,201 (965)	1,296 (557)	2,232 (814)	5,846 (741)	1,798 (836)	2,130 (837)	7,025 (738)	1,756 (813)	1,930 (832)
Overall	14.6 (13, 16.3)	2 (1.9, 2.1)	3.3 (3, 3.6)^***	18.8 (17.5, 20.1)	2.3 (2, 2.8)	2.7 (2.5, 3)^***	7.9 (7.2, 8.6)	2.2 (2.1, 2.3)	2.5 (2.4, 2.7)^***	9.5 (8.6, 10.4)	2.2 (2.1, 2.3)	2.3 (2.1, 2.6)
Sex
Male	14.5 (12.2, 16.9)	1.8 (1.7, 2)	3 (2.8, 3.2)^***	19 (17.3, 20.8)	2.1 (1.9, 2.4)	2.7 (2.4, 3)^***	8.6 (7.7, 9.6)	2.2 (2, 2.4)	2.5 (2.3, 2.8)^**	9.8 (8.5, 11.1)	2.3 (2.1, 2.4)	2.6 (2.2, 3.2)^*
Female	14.7 (12.5, 17.1)	2.1 (2, 2.3)	3.6 (3.1, 4.1)^***	18.5 (16.8, 20.2)	2.6 (2.1, 3.4)	2.8 (2.4, 3.2)	7.2 (6.4, 8.1)	2.1 (2, 2.2)	2.5 (2.3, 2.8)^***	9.3 (8.1, 10.7)	2.1 (1.9, 2.2)	2 (1.9, 2.2)
Age group
0–6 years	8.6 (3.3, 17.8)	2.2 (1.8, 2.8)	2.7 (2.5, 2.9)	11.6 (9.1, 14.3)	1.9 (1.6, 2.1)	2.5 (2.3, 2.8)	7.2 (5.2, 9.5)	2.5 (2.3, 2.8)	2.5 (2.2, 2.8)	10.9 (8, 14.4)	2.7 (2.4, 3)	2.7 (2.4, 3)
7–19 years	16.2 (12.4, 19.9)	2.1 (2, 2.2)	2.5 (2.3, 2.7)	27 (23.9, 30.2)	2.6 (2, 3.4)	2.2 (2.1, 2.4)	11.6 (9.6, 13.5)	2.5 (2.2, 2.8)	2.3 (2, 2.6)	16.4 (13.3, 19.6)	2.2 (2.1, 2.4)	2.1 (1.9, 2.2)
20–39 years	15.3 (12.8, 18)	2.1 (1.9, 2.2)	4.7 (3.8, 5.7)^***	22.4 (19.4, 25.2)	2.2 (2, 2.5)	3.4 (2.8, 4.2)^***	8 (7, 9.1)	1.8 (1.6, 2)	2.9 (2.4, 3.4)^***	9.1 (7.4, 11)	2.2 (1.9, 2.6)	2.8 (2.1, 3.9) ^*
40–59 years	13.8 (11.2, 16.8)	2 (1.9, 2.1)	3.7 (3.2, 4.2)^***	19.9 (17.4, 22.6)	2.8 (2, 4.2)	3.2 (2.6, 3.8)	8.5 (7, 10.4)	2 (1.8, 2.3)	2.6 (2.3, 3.1)^**	9.4 (7.7, 11.2)	2.1 (1.9, 2.3)	2.4 (2.1, 2.7)
≥60 years	13.9 (8.1, 21)	1.4 (1.2, 1.7)	2.4 (2.2, 2.7)^***	12.6 (10.8, 14.3)	1.6 (1.3, 1.9)	2 (1.8, 2.2)^*	5 (4.3, 5.8)	2.3 (2.1, 2.5)	2.3 (2, 2.6)	5.5 (4.7, 6.4)	2 (1.8, 2.2)	1.8 (1.6, 2)
Type of profession
Preschool	8.6 (3.5, 17.2)	2.2 (1.7, 2.8)	2.7 (2.5, 2.9)	10.4 (8, 13.2)	1.9 (1.7, 2.1)	2.6 (2.3, 2.9)	5.2 (3.4, 7.8)	2.6 (2.2, 2.9)	2.4 (2.1, 2.8)	8.3 (5.3, 12)	2.7 (2.3, 3.1)	2.7 (2.3, 3.1)
Student	14.6 (11.6, 18)	2.1 (2, 2.3)	2.5 (2.3, 2.7)	26.2 (23.3, 29.3)	2.5 (2, 3.2)	2.3 (2.1, 2.5)	11.8 (10.1, 13.8)	2.5 (2.3, 2.9)	2.4 (2.2, 2.7)	16.5 (14, 19.5)	2.3 (2.2, 2.5)	2.2 (2, 2.3)
Employed	15.4 (13.4, 17.6)	2.1 (1.9, 2.2)	4.5 (3.9, 5.2)^***	22.5 (20.4, 24.7)	2.5 (2.1, 3.3)	3.6 (3, 4.2)^***	9.3 (8.3, 10.3)	2 (1.8, 2.2)	3 (2.6, 3.4)^***	10.3 (8.8, 12.1)	2.2 (2, 2.4)	2.8 (2.3, 3.6)^***
Working age not in the labor force	14.1 (6, 24.6)	1.8 (1.3, 2.4)	2.8 (2.3, 3.3)^*	14.5 (7.3, 24.2)	1.8 (1.3, 2.3)	2.3 (1.9, 2.9)	5.9 (3.6, 9.4)	1.8 (1.5, 2.1)	1.8 (1.3, 2.3)	5.5 (4.1, 7.3)	2.1 (1.8, 2.4)	1.9 (1.6, 2.2)
Retired	12.1 (7.7, 17.2)	1.5 (1.3, 1.7)	2.4 (2.2, 2.6)^***	11.8 (10.2, 13.3)	1.6 (1.4, 1.8)	2 (1.8, 2.1)^*	4.7 (4.2, 5.4)	2.2 (2, 2.3)	2.2 (2, 2.4)	5.2 (4.5, 6)	1.9 (1.7, 2.1)	1.8 (1.6, 2)
Household size
1	10.5 (5, 17.6)	0.6 (0.1, 1.4)	2.2 (1.1, 3.7)^**	15.2 (10.5, 20.2)	0.3 (0.2, 0.5)	0.4 (0.2, 0.8)	5.5 (4.1, 7.1)	0.8 (0.6, 1.1)	1 (0.6, 1.3)	5.5 (3.8, 7.8)	1 (0.4, 1.9)	0.7 (0.3, 1.2)
2	12.6 (7.9, 17.8)	1.1 (0.9, 1.2)	1.9 (1.6, 2.3)^***	14.5 (12.5, 16.6)	1.4 (1.1, 1.8)	1.4 (1.2, 1.7)	6.4 (4.8, 8.1)	1.3 (1.2, 1.4)	1.9 (1.5, 2.5)^***	6.6 (5.4, 8)	1.4 (1.2, 1.6)	1.4 (1.2, 1.6)
3	14.8 (12.5, 17.3)	1.9 (1.8, 2)	3.4 (2.9, 3.9)^***	20.3 (18.5, 22.1)	2.2 (2.1, 2.4)	2.7 (2.4, 3.1)^***	8.8 (7.9, 9.7)	2.3 (2.1, 2.5)	2.8 (2.6, 3.1)^***	11.3 (9.6, 13)	2.2 (2.1, 2.3)	2.3 (2.1, 2.4)
4	11.9 (9.2, 15.4)	2.3 (2.2, 2.5)	3.4 (3.2, 3.6)^***	20.3 (16.6, 24.7)	3 (2.8, 3.2)	4.2 (3.5, 5.1)^***	8.4 (7.2, 10)	3.1 (2.9, 3.2)	3.1 (2.9, 3.3)	10.8 (8.5, 13.7)	3 (2.8, 3.1)	3.7 (2.7, 5.4)^*
≥5	21.5 (16.2, 27.5)	3.2 (2.9, 3.5)	5.7 (4.8, 6.8)^***	21.4 (18.1, 25.4)	5.9 (3.9, 9.2)	5 (4.1, 6.7)	10.2 (8.3, 12.3)	4.3 (4.1, 4.5)	4.3 (4, 4.6)	11.3 (8.9, 14.2)	3.9 (3.7, 4.1)	4.2 (3.8, 4.6)