Table 2.

Predictors of neutralizing antibody titers in human males and females estimated using the best-fit model

Epidemiological factor	DF	F value	p-Value
Hypothyroidism	1, 158	0.0841	0.7722
Hysterectomy/vasectomy/post-menopausal	1, 158	0.0004	0.9849
Oral contraceptive use	1, 158	0.2542	0.6148
Depression and/or anxiety	1, 158	0.3081	0.5796
Corticosteroids	1, 158	0.1883	0.6649
Age	35, 158	2.1267	0.0009*
Gender	1, 158	4.5181	0.0351*
Chronic respiratory disease or smoker	1, 158	1.9411	0.1655
Hysterectomy/vasectomy/post-menopausal × oral contraceptive use	1, 158	0.0058	0.9397
Age × gender	16, 158	3.6545	1.15E−05*
Age × chronic respiratory disease or smoker	4, 158	3.5479	0.0084*

Model AIC value = 3033.339 (model > 10 AIC values less than other models)

*Statistically significant effect at p < 0.05