Characteristics

sex

OR [95% CI]

p-value

Antibody titer group positive

Male

n (%)

Female

n (%)

1:160 or less

117 (47.95)

127 (52.05)

1.89 [1.12 to 3.6]

0.26

1:320 to 1:640

113 (50.67)

110 (49.33)

0.78 [0.33 to 1.53]

0.36

1:1280 to 1:2560

39 (37.86)

64 (62.14)

2.19 [0.94 to 5.1]

0.09