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. Author manuscript; available in PMC: 2013 Jul 23.
Published in final edited form as: Behav Genet. 2009 Oct 15;40(1):49–58. doi: 10.1007/s10519-009-9301-0

Table 4.

Quitting characteristics among currently smoking cases and controls, respectively

A2A2 A1A1 + A1A2 P-valuea B2B2 B1B1 + B1B2 P-valuea
Cases
Attempted to quit, n (%) 0.230 0.175
  Yes 46 (56.79) 23 (46.00) 51 (56.67) 18 (43.90)
  No 35 (43.21) 27 (54.00) 39 (43.33) 23 (56.10)
Intention to quit, n (%) 0.467 0.431
  No intention 6 (7.69) 6 (12.50) 8 (9.20) 4 (10.26)
  Moderate intention 17 (21.79) 13 (27.08) 18 (20.69) 12 (30.77)
  Extreme intention 55 (70.51) 29 (60.42) 61 (70.11) 23 (58.97)
Quit confidence, n (%) 0.316 0.431
  No intention 5 (6.41) 7 (14.58) 7 (8.05) 5 (12.82)
  Moderate intention 23 (29.49) 13 (27.08) 23 (26.44) 13 (33.33)
  Extreme intention 50 (64.10) 28 (58.33) 57 (65.52) 21 (53.85)
Quit Attempts, mean ± SD 8.06 ± 9.55 7.24 ± 14.50 0.715 8.29 ± 12.44 6.50 ± 8.83 0.331
Controls
Attempted to quit, n (%) 0.726 1.000
  Yes 7 (30.43) 4 (22.22) 6 (25.00) 5 (29.41)
  No 16 (69.57) 14 (77.78) 18 (75.00) 12 (70.59)
Intention to quit, n (%) 0.713 0.563
  No intention 1 (4.35) 2 (11.11) 1 (4.17) 2 (11.76)
  Moderate intention 10 (43.48) 8 (44.44) 10 (41.67) 8 (47.06)
  Extreme intention 12 (52.17) 8 (44.44) 13 (54.17) 7 (41.18)
Quit confidence, n (%) 0.532 0.343
  No intention 2 (8.70) 2 (11.11) 2 (8.33) 2 (11.76)
  Moderate intention 8 (34.78) 9 (50.00) 8 (33.33) 9 (52.94)
  Extreme intention 13 (56.52) 7 (38.89) 14 (58.33) 6 (35.29)
Quit Attempts, mean ± SD 10.54 ± 11.37 4.15 ± 5.08 0.019 9.84 ± 11.40 4.74 ± 5.29 0.056
a

P-value for student’s t-test (continuous variables) or χ2 test (categorical variables)