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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

From: A randomised controlled trial of a smoking cessation intervention delivered by dental hygienists: a feasibility study

  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%)
  1. Carbon monoxide (CO) quitter: <8 ppm, Cotinine (COT) quitter: <20 ng/ml
  2. *COT >20 ng/ml but evidence of NRT use at time of sampling
  3. **COT >20 ng/ml but CO <<8 ppm
  4. †self reported quitter but cotinine level above cut-offs (373 ng/ml and 385 ng/ml)
  5. ‡self reported quitter but did not return biochemical sample
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