Table 1

Population characteristics and abstinence at the 12-month and at the long-term follow-up, % (number) except for age
Total High-intensity treatment Low-intensity treatment p-value*
(N = 284)
(nHIT = 141) (nLIT = 143)
Gender:
Men 20 (58/284) 18 (26/141) 22 (32/143) .410
Women 80 (226/284) 82 (115/141) 78 (111/143)
Age at baseline:
mean (SD) 48.6 (10.3) 48.7 (9.6) 48.5 (11.0)
median 49.0 48.0 49.0 .825
quartiles 42.0; 56.0 42.0; 56.0 41.0; 56.0
Education in years:
0 - 9 22 (61/278) 18 (25/137) 26 (36/141) .336
10 - 12 41 (115/278) 44 (60/137) 39 (55/141)
≥ 13 37 (102/278) 38 (52/137) 35 (50/141)
Number of smoked cigarettes/week at baseline:
mean (SD) 106 (45) 106 (50) 105 (40)
median 105 105 105 .794
quartiles 70; 140 70; 140 70; 140
Intention to quit at baseline:
not within 6 months 1 (4/278) 1 (1/137) 2 (3/141) .120
within 6 months 50 (139/278) 46 (63/137) 54 (76/141)
within 1 month 48 (133/278) 52 (71/137) 44 (62/141)
trying just now 1 (2/278) 1 (2/137) 0 (0/141)
12-month follow-up:
Point prevalence abstinence 19 (55/284) 23 (32/141) 16 (23/143) .159
of which:
< 6 months 5 (15/284) 4 (6/141) 6 (9/143) .443
≥ 6 months§ 14 (40/284) 18 (26/141) 10 (14/143) .036
Long-term follow-up:
Point prevalence abstinence 27 (78/284) 31 (44/141) 24 (34/143) .161
31 (76/241) 35 (43/121) 27 (33/120) .179
6-month continuous abstinence 22 (63/284) 26 (36/141) 19 (27/143) .177
25 (61/241) 29 (35/121) 22 (26/120) .195
Sustained abstinence 9 (24/284) 12 (17/141) 5 (7/143) .030
10 (24/241) 14 (17/121) 6 (7/120) .033

* Statistical significant difference between HIT and LIT tested with chi-square test, except for age and number of cigarettes at baseline which were tested with Mann–Whitney U-test.

Information from 278 participants (137 HIT, 141 LIT) because six did not reply to the baseline questionnaire.

According to intention-to-treat, non-responders treated as smokers.

§ Equal to 6-month continuous abstinence.

Responder-only abstinence.

p-value for grouping into “not within 6 months/within 6 months” vs. “within 1 month/trying just now” because 4 cells (50.0%) had expected count less than 5 in the original grouping.

Nohlert et al.

Nohlert et al. BMC Public Health 2013 13:592   doi:10.1186/1471-2458-13-592

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