Table 2 Participant baseline characteristics
|  | Control group n = 40 | Intervention group n = 40 | Total n = 80 |
|---|---|---|---|
Sex, n (%) | |||
 Female | 20 (50%) | 22 (55%) | 42 (52.5%) |
 Male | 20 (50%) | 18 (45%) | 38 (47.5%) |
Ethnicity, n (%) | |||
 White (British, Irish, other White) | 36 (90%) | 39 (97.5%) | 75 (93.8%) |
 Asian or Asian British (Indian, Pakistani, Bangladeshi, other Asian) | 4 (10%) | 1 (2.5%) | 5 (6.3%) |
Occupation, n (%) | |||
 Working in a routine or manual occupation | 9 (22.5%) | 11 (27.5%) | 20 (25%) |
 Working in an intermediate occupation | 9 (22.5%) | 13 (32.5%) | 22 (27.5%) |
 Working in a managerial or professional occupation | 9 (22.5%) | 9 (22.5%) | 18 (22.5%) |
 Unemployed/not working for a year or more | 6 (15%) | 2 (5%) | 8 (10%) |
 Full-time student | 0 | 1 (2.5%) | 1 (1.3%) |
 Retired | 1 (2.5%) | 4 (10%) | 5 (6.3%) |
 Sick/disabled/unable to return to work | 4 (10%) | 0 | 4 (5.0%) |
 Home carer (unpaid) | 2 (5%) | 0 | 2 (2.5%) |
Age (years), mean (SD) | 44.6 (9.5) | 44.0 (11.8) | 44.3 (10.7) |
Number of cigarettes/day (any), mean (SD) | 17.5 (6.9) | 17.4 (6.4) | 17.4 (6.6) |
Number of factory cigarettes/day, mean (SD) | 16.6 (7.2), n = 33 | 14.8 (4.4), n = 26 | 15.8 (6.1), n = 59 |
Number of hand-rolled cigarettes/day, mean (SD) | 19.0 (7.1), n = 8 | 22.1 (7.0), n = 14 | 21.0 (7.0), n = 22 |
Age started smoking, mean (SD) | 16.0 (2.8) | 15.3 (3.2) | 15.7 (3.0) |
eCO (ppm), mean (SD) | 18.1 (10.0) | 23.0 (12.2) | 20.6 (11.3) |
FTND, mean (SD) | 5.0 (2.4) | 5.0 (1.8) | 5.0 (2.1) |
MPSS, mean (SD) | 22.8 (7.0) | 22.8 (5.9) | 22.8 (6.4) |
SC (ng/ml), mean (SD) | 303.4 (128.3) | 342.6 (138.1) | 323.5 (134.0) |
SA (ng/ml), mean (SD) | 1.1 (1.4) | 1.2 (1.2) | 1.2 (1.3) |
Number of teeth (excluding 3rd molars), mean (SD) | 24.0 (3.6) | 23.8 (4.0) | 23.9 (3.8) |
Mean PI, mean (SD) | 1.1 (0.7) | 0.8 (0.6) | 1.0 (0.7) |
% BOP score, mean (SD) | 23.9 (18.3) | 16.5 (13.4) | 20 (16.4) |
Mean MGI, mean (SD) | 2.5 (0.5) | 2.5 (0.4) | 2.5 (0.5) |
Mean PPD (mm), mean (SD) | 4.1 (0.8) | 3.9 (0.7) | 4.0 (0.7) |
Mean CAL (mm), mean (SD) | 5.2 (1.4) | 5.1 (1.3) | 5.1 (1.3) |
PESA (mm2), mean (SD) | 2134.1 (666.7) | 2013.8 (644.4) | 2073.9 (654.3) |
PISA (mm2), mean (SD) | 634.5 (629.9) | 386.7 (346.2) | 510.6 (520.2) |
No. of sites with PPD ≥ 5 mm, mean (SD) | 60.5 (30.9) | 54.3 (27.5) | 57.4 (29.2) |
% of sites with PPD ≥ 5 mm, mean (SD) | 42.2 (19.6) | 38.4 (18.1) | 40.3 (18.8) |
No. of sites with PPD ≤ 4 mm, mean (SD) | 83.3 (32.1) | 87.1 (30.3) | 85.2 (31.1) |
% of sites with PPD ≤ 4 mm, mean (SD) | 58.0 (19.4) | 60.8 (19.1) | 59.4 (19.2) |
CODS, mean (SD) | 4.0 (1.3) | 4.1 (1.0) | 4.0 (1.2) |
OHQoL-UK, mean (SD) | 42.7 (6.6) | 43.6 (8.7) | 43.1 (7.7) |