Variables

Secondary Cases of Asymptomatic Primary Cases

N = 8

Secondary Cases of Symptomatic Primary Cases

N = 62

Statistical Significance

Total number of family members

13

118

-

Family size (number of family members)
[mean and standard deviation]

3.25 + -1.08

3.37 + -0.92

t-value = -0.23681. p = 0.407054. NS

Secondary attack rate (Number of secondary cases in relation to the number of members in the family - exposed population)

8/13 (61)

62/118 (52)

X² = 0.3809. p = 0.537138. NS.

-Family with > = 4 members

1 (12)

37 (60)

Fisher exact test = 0.0198. Significant at p < 0.05.

-Asymptomatic

6 (75)

19 (31)

Fisher exact test = 0.021. Significant at p < 0.05.

-Women

6 (75)

45 (73)

Fisher exact test = 1. NS.

> = 65 years

0

6 (10)

Fisher exact test = 1. NS.

< 45 years

7 (87)

43 (69)

Fisher exact test = 0.4243. NS.

-Social-occupancy class of patients (people with some type of labor specialization)

2 (25)

18 (29)

Fisher exact test = 1. NS.

Students

4 (50)

23 (37)

X² with Yates correction = 0.1022. p = 0.749169. NS.

-Ethnic minority

6 (75)

17 (27)

Fisher exact test statistic = 0.0128. Significant at p < 0.05.

-Low income household

2 (25)

21 (34)

Fisher exact test = 0.7122. NS.

-Complex family

2 (25)

10 (16)

Fisher exact test = 0.6178. NS.

-Chronic diseases presence

2 (25)

22 (35)

Fisher exact test = 0.7061. NS.

-Mild severity

8 (100)

59 (95)

Fisher exact test = 1. NS.