Table 2

Breakdown of number of participants followed-up and quitters at 3 and6 months and 1 year, as defined by self-report, carbon monoxide and salivary cotinine


3 months
6 months
1 Year


Intervention
(n = 59)
Control
(n = 57)
Intervention
(n = 59)
Control
(n = 57)
Intervention
(n = 59)
Control
(n = 57)

Number (%) followed up
52 (88.1%)
50 (87.7%)
36 (61.0%)
35 (61.4%)
33 (55.9%)
23 (40.4%)
Number (%) of self-reported quitters
9/59 (15.3%)
5/57 (8.8%)
6/59 (10.2%)
3/57 (5.3%)
7/59 (11.9%)
3/57 (5.3%)
Number (%) of quitters by Carbon Monoxide
9/59 (15.3%)
4/57 (7.0%) (1 missing value)
6/59 (10.2%)
2/57 (3.5%) (1 missing value)
na
na
Number (%) of quitters by Cotinine
6 + 1* + 2** (15.3%)
2 + 2* + 1** (8.8%)
5 + 1* (10.2%)
2 + 1* (5.3%)
4 + 1+ 2
2 + 1
Quitters
9/59 (15.3%)
5/57 (8.8%)
6/59 (10.2%)
3/57 (5.3%)
4/59 (6.8%)
2/57 (3.5%)

Carbon monoxide (CO) quitter: <8 ppm, Cotinine (COT) quitter: <20 ng/ml

*COT >20 ng/ml but evidence of NRT use at time of sampling

**COT >20 ng/ml but CO <<8 ppm

self reported quitter but cotinine level above cut-offs (373 ng/ml and 385 ng/ml)

self reported quitter but did not return biochemical sample

Binnie et al. BMC Oral Health 2007 7:5   doi:10.1186/1472-6831-7-5