2011

2012

Chi-square value

p level

Association [n (%)]

74 (12.21)^a

2 (0.33)^b

110.62

p < 0.01

Z

8.53

−8.53

Possible association [n (%)]

75 (12.38)^a

23 (3.80)^b

Z

5.48

−5.48

No association [n (%)]

457 (75.41)^b

581 (95.87)^a

Z

−10.16

10.16