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Table 1 Baseline individual variables at enrolment of periodontal patients

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

Variable Intervention (n = 59) Control (n = 57) Comparison of I and C groups
Demographics    
Mean (SD) Age (years) 39.9 (8.0) 43.5 (8.0) 95% CI (C-I) = (0.6, 6.5)
Gender (female) 45/59 (76%) 37/57 (65%) χ2 = 1.805 df = 1 p = 0.179
Deprivation Category (5–7 i.e. more deprived) 28/59 (47%) 29/57 (51%) χ2 = 0.136 df = 1 p = 0.713
Nicotine Dependence and Exposure    
Median (IQ) number of cigarettes/day 20 (15–40) 20 (15–25) 95% CI (C-I) = (-1,5)
Mean (SD) number of years smoked 22.5 (7.9) 25.2 (8.2) 95% CI (C-I) = (-0.3, 5.6)
Mean (SD) pack years 21.5 (12.5) 24.8 (12.1) 95% CI (C-I) =(-1.3, 8.0)
Median (IQ) Heaviness of Smoking Index (HSI) 3.0 (3.0–4.0) 4.0 (3.0–4.0) 95% CI (C-I) = (0.0, 1.0)
Median (IQ) Fagerstrom Test for Nicotine Dependence (FTND) 5.0 (3–6) 5.0 (3–7) 95% CI (C-I) = (0.0, 1.0)
Exposure to smoke at home 32/59 (56%) 27/57 (52%) χ2 = 1.061 df = 2 p = 0.628
Intention to quit    
Motivation to quit/'Stage of Change'    
   • Precontemplator 6/59 (10%) 9/57 (16%) χ2 = 1.076 df = 2 p = 0.584
   • Contemplator 26/59 (44%) 26/57 (46%)  
   • Preparation 27/59 (46%) 22/57 (38%)  
Biochemical Measures    
Mean (SD) cotinine level (ng/ml) 231.9 (95.0) 243.3 (104.3) 95% CI (C-I) = (-25.3, 48.2)
Mean (SD) CO level (ppm) 22.0 (8.8) 20.8 (9.1) 95% CI (C-I) = (-2.2, 4.5)