Table 4 Effect Modification of Association between ILI and Ischemic stroke by demographic and sociodemographic characteristics

0–15 days before event

1.38 (1.08, 1.78)

1.43 (0.63, 3.22)

0.98

1.57 (1.13, 2.18)

1.22 (0.85, 1.72)

0.82

1.40 (0.88, 2.24)

1.43 (0.99, 2.04)

0.79

0–30 days before event

1.45 (1.21, 1.75)

1.65 (1.05, 2.59)

0.10*

1.82 (1.43, 2.30)

1.17 (0.91, 1.51)

0.04*

1.34 (0.95, 1.89)

1.47 (1.15, 1.89)

0.56

0–60 days before event

1.48 (1.28, 1.70)

1.51 (1.07, 2.12)

0.93

1.65 (1.37, 1.98)

1.33 (1.10, 1.60)

0.11

1.36 (1.05, 1.76)

1.49 (1.23, 1.80)

0.64

0–90 days before event

1.56 (1.38, 1.76)

1.79 (1.33, 2.41)

0.56

1.75 (1.49, 2.06)

1.45 (1.23, 1.69)

0.23

1.56 (1.25, 1.95)

1.55 (1.31, 1.82)

0.36

0–180 days before event

1.69 (1.52, 1.87)

1.63 (1.29, 2.07)

0.87

1.87 (1.63, 2.14)

1.53 (1.34, 1.74)

0.08*

1.71 (1.42, 2.05)

1.52 (1.33, 1.74)

0.50

0–365 days before event

1.71 (1.57, 1.87)

1.57 (1.29, 1.91)

0.51

1.73 (1.54, 1.95)

1.66 (1.49, 1.84)

0.54

1.64 (1.41, 1.92)

1.56 (1.401, 1.744)

0.93