Table 4 Slope index of inequality (SII) and relative index of inequality (RII) in current smoking according to the SES indicators by survey year and sex

 Crude SII (95%CI)

14.2

(7.7, 20.6)

4.5

(-0.7, 9.8)

2.5

(−1.5, 6.6)

0.005

 Adjusted SII (95%CI)^a

14.8

(8.3, 21.3)

4.6

(-1.1, 10.4)^b

3.1

(−0.4, 6.6)

0.004

 Crude RII (95%CI)

3.56

(1.89, 6.71)

1.96

(0.92, 4.17)

1.80

(0.71, 4.54)

0.180

 Adjusted RII (95%CI)^a

3.60

(1.91, 6.79)

1.87

(0.88, 3.99)

1.82

(0.72, 4.58)

0.187

 Crude SII (95%CI)

13.2

(4.2, 22.1)

7.5

(0.4, 14.5)

3.6

(−2.0, 9.1)

0.066

 Adjusted SII (95%CI)^a

13.2

(4.3, 22.1)

7.5

(0.4, 14.7)^b

3.3

(−1.8, 8.4)

0.076

 Crude RII (95%CI)

2.76

(1.48, 5.16)

2.51

(1.14, 5.55)

2.04

(0.74, 5.62)

0.625

 Adjusted RII (95%CI)^a

2.76

(1.48, 5.15)

2.55

(1.16, 5.62)

2.16

(0.79, 5.94)

0.685

 Crude SII (95%CI)

9.9

(2.0, 17.8)

17.1

(10.2, 24.0)

15.0

(8.9, 21.2)

0.449

 Adjusted SII (95%CI)^a

10.6

(2.4, 18.9)

17.1

(10.3, 24.0)^b

14.7

(8.6, 20.9)^b

0.362^b

 Crude RII (95%CI)

2.27

(1.22, 4.24)

8.72

(3.86, 19.74)

17.48

(6.24, 48.96)

<0.001

 Adjusted RII (95%CI)^a

2.42

(1.29, 4.54)

8.70

(3.86, 19.62)

16.54

(5.91, 46.30)

<0.001

 Crude SII (95%CI)

6.4

(1.9, 10.8)

3.9

(1.0, 6.7)

3.3

(1.0, 5.6)

0.170

 Adjusted SII (95%CI)^a

5.8

(1.4, 10.2)

4.3

(1.0, 7.6)^b

3.4

(0.9, 6.0)^b

0.210^b

 Crude RII (95%CI)

3.37

(1.44, 7.89)

5.62

(1.6, 19.75)

7.70

(1.51, 39.23)

0.314

 Adjusted RII (95%CI)^a

3.31

(1.41, 7.75)

5.23

(1.5, 18.23)

7.87

(1.54, 40.31)

0.309

 Crude SII (95%CI)

11.8

(5.0, 18.6)

8.6

(3.7, 13.4)

2.9

(−0.6, 6.3)

0.006

 Adjusted SII (95%CI)^a

11.9

(5.2, 18.6)

8.9

(3.9, 13.9)^b

3.1

(−0.2, 6.4)

0.019^b

 Crude RII (95%CI)

5.25

(2.30, 12.02)

13.38

(4.00, 44.76)

3.88

(0.89, 16.81)

0.931

 Adjusted RII (95%CI)^a

5.32

(2.33, 12.18)

14.12

(4.23, 47.14)

4.13

(0.95, 17.92)

0.899

 Crude SII (95%CI)

6.4

(0.3, 12.6)

6.3

(1.5, 11.1)

5.2

(1.6, 8.8)

0.587

 Adjusted SII (95%CI)^a

5.6

(-0.7, 11.9)

6.4

(1.6, 11.1)^b

5.4

(1.8, 8.9)

0.716^b

 Crude RII (95%CI)

2.64

(1.12, 6.20)

6.71

(1.98, 22.68)

12.26

(2.61, 57.58)

0.054

 Adjusted RII (95%CI)^a

2.58

(1.09, 6.07)

6.88

(2.03, 23.26)

11.85

(2.52, 55.64)

0.058