Table 1 Characteristics of the participants (N = 15 428)

Socio-demographic characteristics

Age, years

 19 or below

178 (1.2%)

 20 to 25

2674 (17.3%)

 26 to 30

6388 (41.4%)

 31 to 35

4628 (30.0%)

 36 to 40

1325 (8.6%)

 41 or above

235 (1.5%)

Education level

 Primary or below

275 (1.8%)

 Junior secondary

2556 (16.6%)

 Senior secondary

2959 (19.2%)

 Matriculation

4171 (27.0%)

 Undergraduate

4553 (29.5%)

 Postgraduate or above

914 (5.9%)

Place of residence

 Northern China

  Liaoning

680 (4.4%)

  Beijing

1845 (12.0%)

 Eastern China

  Shandong

3975 (25.8%)

  Zhejiang

3657 (23.7%)

 Southern China

  Guangdong

806 (5.2%)

  Shenzhen

870 (5.6%)

  Guangxi

562 (3.6%)

  Chongqing

635 (4.1%)

 Central China

  Henan

286 (1.9%)

  Hunan

1259 (8.2%)

 Northwest China

  Shaanxi

525 (3.4%)

  Qinghai

327 (2.1%)

Pregnancy-related characteristics

Parity

 Nulliparous

8719 (56.5%)

 Primiparous

5976 (38.7%)

 Multiparous

733 (4.8%)

Gestational age

M = 25.79, SD = 9.40

 1st trimester (12 weeks or below)

1467 (9.5%)

 2nd trimester (13 to 26 weeks)

6280 (40.7%)

 3rd trimester (27 weeks or above)

7681 (49.8%)

Pregnancy-related complications

 No

14 040 (91.0%)

 Yes

1388 (9.0%)

Contextual factors

Place of residence being locked down

 No

6035 (39.1%)

 Yes

9393 (60.9%)

Being quarantined

 No

14 849 (96.2%)

 Yes

579 (3.8%)

Someone they personally knew being infected

 No

15 352 (99.5%)

 Yes

76 (.5%)

Cognitive factors

Perception that COVID-19 will be under control in the coming month

 Certainly not

70 (.5%)

 Very small chance

180 (1.2%)

 Small chance

986 (6.4%)

 Large chance

2194 (14.2%)

 Very large chance

5974 (38.7%)

 Certainly yes

6024 (39.0%)

Perception that COVID-19 will pose long term physical harm to human

 Don’t know

5554 (36.0%)

 No

962 (6.2%)

 Yes

8912 (57.8%)

Social factor

Social support score (mean, range 1 to 10)

Mean = 8.60, SD = 2.03