Table 4 Observed frequencies of abstinence from month 31 to end of month 48

Sex

Men (%)

265/659(40.2)

28/601 (4.7)

35.5(23.6-49.8)

P<0.001

Women

345/718 (48.0)

35/628 (5.6)

42.4(27.8-58.6)

P<0.001

Age

40~

87/221( 39.4)

5/197 (2.5)

36.9(29.5-45.6)

P<0.001

50~

118/280 (42.1)

11/250 (4.4)

37.7(26.5-50.1)

P<0.001

60~

171/385 (44.4)

17/343 (5.0)

39.4(26.6-53.4)

P<0.001

70~

167/362 (53.8)

17/323 (5.3)

48.5(37.8-60.7)

P<0.001

80~

67/129 (51.9)

13/117 (11.1)

40.8(33.5-49.2)

P<0.001

Education level

High

74/143 (51.7)

8/129 (6.2)

45.5(37.7-54.3)

P<0.001

Middle

137/313 (43.8)

14/280 (5.1)

38.7(25.4-53.2)

P<0.001

Low

399/921 (43.3)

41/821 (5.0)

38.3(20.6-57.3)

P<0.001

Household income

High

48/112 (42.8)

7/114(6.1)

36.7(30.3-43.9)

P<0.001

Middle

524/1173 (44.7)

53/1051 (5.0)

39.7(20.5-59.8)

P<0.001

Low

38/92 (41.2)

3/65 (4.6)

36.6(31.3-42.4)

P<0.001

Alcohol user

Yes

201/498 (40.4)

17/434 (3.9)

36.5(25.6-49.4)

P<0.001

No

409/879 (46.5)

46/796 (5.8)

40.7(26.4-56.1)

P<0.001

Comorbidities

P<0.001

Yes

68/136 (50.0)

15/121 (12.4)

37.6(25.3-55.4)

P<0.001

No

542/1241 (43.4)

48/1109 (3.9)

39.5(20.7-58.6)

P<0.001

Depression

Yes

95/513/(18.5)

13/518(2.5)

16.0(12.7-20.5)

P<0.001

No

515/864(59.6)

50/712(7.0)

52.6(41.9-63.5)

P<0.001

Anxiety

P<0.001

Yes

81/258 (31.4)

9/230 (4.0)

27.4(20.1-35.7)

P<0.001

No

529/1119 (47.3)

54/1000 (5.4)

42.1(33.3-51.1)

P<0.001

Pack years

<30

266/564 (47.2)

32/504 (6.3)

40.9(32.4-50.4)

P<0.001

30~

200/454 (44.1)

18/406 (4.4)

39.7(31.8-48.2)

P<0.001

40~

144/359 (40.1)

13/320 (4.1)

36.0(29.7-43.3)

P<0.001

Nicotine addiction (FagerstrÖm score)

0~3

243/432(56.3)

25/386 (6.5)

49.8(35.6-64.6)

P<0.001

4~6

233/486(47.9)

23/434 (5.3)

42.6(29.1-56.7)

P<0.001

≥7

134/459 (29.2)

15/320 (4.7)

24.5(13.4-36.6)

P<0.001

MRC scales

0

21 /70(30.0)

2/71 (2.8)

27.2(22.6-32.3)

P<0.001

1

107/272 (39.3)

7/243(2.9)

36.4(27.5-46.3)

P<0.001

2

175 /398(44.0)

17/356 (4.8)

39.2(27.7-51.7)

P<0.001

3

178/380 (46.8)

20/339 (5.9)

40.9(28.1-54.4)

P<0.001

4

129/257 (50.2)

15/221 (6.8)

43.4(31.1-56.7)

P<0.001

Smoking history of family members

Yes

247/816 (30.3)

28/729(3.8)

26.5(13.2-40.1)

P<0.001

No

363/561 (64.7)

37/501 (7.4)

57.3(38.9-76.2)

P<0.001

Smoking history of the responsible doctor or nurse

Yes

214/589 (36.3)

22/526 (4.2)

32.1(21.7-43.9)

P<0.001

No

396/788 (50.3)

41/704 (5.8)

44.5(32.1-57.6)

P<0.001