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Table 2 Factors associated with incubation period among 1604 cases using accelerated failure time model

From: Epidemiological features of COVID-19 patients with prolonged incubation period and its implications for controlling the epidemics in China

Factors

N

Univariate analysis

Multivariate analysis#

EXP(β) (95%CI)

P-value

EXP(β) (95%CI)

P-value

Sex

 Female

809

1

  

 Male

795

1.030 (0.961, 1.104)

0.406

  

Age, year

 > 60

494

1

1

 0–45

367

0.960 (0.879, 1.049)

0.366

0.945 (0.868, 1.030)

0.200

 46–60

743

0.903 (0.821, 0.993)

0.035

0.898 (0.819, 0.986)

0.024

Occupation

 Manual workera

128

1

  

 Farmer

312

0.920 (0.795, 1.065)

0.266

  

 Office worker

288

0.973 (0.841, 1.126)

0.711

  

 Public service worker

249

0.945 (0.812, 1.099)

0.464

  

 Unemployed

627

0.980 (0.857, 1.120)

0.767

  

Geographical Location

 Northern

513

1

  

 Central

691

0.961 (0.886, 1.041)

0.329

  

 Southern

400

1.025 (0.934, 1.125)

0.608

  

Type of residence

 Urban area

1005

1

  

 Rural area

599

1.023 (0.952, 1.100)

0.529

  

Underlying disease

 None

1149

1

  

 Cardio-cerebrovascular disease

242

0.997 (0.901, 1.103)

0.951

  

 Diabetes

76

0.947 (0.802, 1.119)

0.521

  

 Other diseases

233

0.972 (0.880, 1.072)

0.567

  

Epidemic phase

 Before Level I response

147

1

1

 After Level I response

1457

1.811 (1.618, 2.027)

< 0.001

1.825 (1.631, 2.042)

< 0.001

Infection route

 Contact in public places

529

1

1

 Household contact

959

0.827 (0.769, 0.890)

< 0.001

0.814 (0.758, 0.874)

< 0.001

 Contact in workplaces

116

0.950 (0.828, 1.089)

0.461

0.954 (0.836, 1.089)

0.485

  1. #Factors with P-value greater than 0.1 in univariate analysis were excluded from the multivariate analysis
  2. aManual worker contains construction worker, factory worker, cleaner, etc.