Table 3 The incidence rate ratio of using licit prescription drugs and costs for licit prescription drug use among patients

Gender¹

Female

1

1

Male

0.97 (0.96–0.98)

0.000

1.14 (1.13–1.15)

0.000

Age (years)²

20–29

1

1

30–39

1.07 (1.05–1.09)

0.000

1.07 (1.05–1.10)

0.000

40–49

1.50 (1.47–1.53)

0.000

1.42 (1.39–1.46)

0.000

50–59

2.18 (2.14–2.22)

0.000

1.63 (1.59–1.67)

0.000

60–69

2.97 (2.91–3.03)

0.000

1.88 (1.84–1.92)

0.000

70–79

3.68 (3.60–3.76)

0.000

1.95 (1.90–1.99)

0.000

80

4.50 (4.40–4.60)

0.000

1.95 (1.91–2.00)

0.000

Educational level³

up to 60–69 years

1

1

1

2

0.99 (0.96–1.02)*

0.341

1.05 (1.02–1.09)

0.002

3

0.85 (0.83–0.87)

0.000

0.96 (0.93–0.98)

0.002

4

0.78 (0.76–0.80)

0.000

0.92 (0.89–0.94)

0.000

Income level³

1

1

1

2

1.00 (0.99–1.02)*

0.657

0.97 (0.96–0.99)

0.001

3

0.81 (0.80–0.82)

0.000

0.83 (0.82–0.85)

0.000

4

0.73 (0.71–0.74)

0.000

0.71 (0.70–0.72)

0.000