Table 3.

Interaction analysis: seasonal influence on gender, postpartum status and age on the CVT risk

Interaction analysis		OR	95% CI	P
Gender and Season
Female and summer	233 (24.0%)	1.41	1.11-1.78	0.005
Female and autumn	197 (20.3%)	1.46	1.14-1.86	0.002
	145 (14.9%)
Female and winter		1.31	1.01-1.70	0.039
Male and summer	176 (18.1%)	1.22	0.95-1.56	0.117
Male and autumn	120 (12.4%)	1.02	0.78-1.34	0.868
Male and winter	97 (10.0%)	1.00
Postpartum vs Season
Postpartum=Yes and Summer	95 (16.5%)	1.2	0.9,1.6	0.340
Postpartum=Yes and Autumn	73 (12.7%)	1.1	0.9,1.6	0.419
Postpartum=Yes and Winter	69 (12.0%)	1.1	0.8,1.5	0.567
Postpartum=No and Summer	138 (24.0%)	1.2	0.9,1.5	0.312
Postpartum=No and Autumn	125 (21.7%)	1.2	0.9,1.5	0.296
Postpartum=No and Winter	76 (13.2%)	1.0
Age vs Season
<40 and Summer	267 (27.5%)	1.432	1.094,1.87	0.009
<40 and Autumn	230 (23.7%)	1.323	1.006,1.73	0.045
<40 and Winter	176 (18.1%)	1.217	0.917,1.61	0.173
≥40 and Summer	143 (14.7%)	1.157	0.864,1.54	0.328
≥40 and Autumn	88 (9.1%)	1.050	0.763,1.44	0.764
≥40 and Winter	66 (6.8%)	1.00