Table 1.

Characteristics of all participants in the study

Parameter	Experimental group (n = 114)	Control group (n = 107)
Age (years; mean ± SD)	55.3 ± 13.5	56.2 ± 12.7
Males (n) Females (n)	75 39	72 35
Oral health status Missing teeth (n; mean ± SD) PD (mm; mean ± SD) CAL (mm; mean ± SD) BOP (% site; mean ± SD SUP (% site; mean ± SD) GI = 0 (n) GI = 1 (n) GI = 2 (n) GI = 3 (n)	5.7 ± 1.5 5.4 ± 0.5 4.6 ± 0.6 2.4 ± 4.4 2.0 ± 3.4 15 13 20 17	5.6 ± 1.6 5.5 ± 0.6 4.5 ± 0.7 2.2 ± 4.5 2.1 ± 3.4 13 10 19 15
Good hygiene status, n (%) Poor hygiene status, n (%)	33 (28.9%) 81 (71.1%)	29 (27.1%) 78 (72.9)
Initial PFT, mean ± SD FVC (% pred) FEV1 (% pred) FEV1/FVC >80%, n (%) DLCO (% pred) DLCO >80% pred, n (%)	101.7 ± 16.4 103.6 ± 20.3 114 (100%) 97.2.0 ± 17.1 114 (100%)	102.1 ± 15.9 102.9 ± 19.7 107 (100%) 96.7 ± 16.4 107 (100%)
Smoking Ever‐smoker, n (%) Pack‐year, mean ± SD	71 (62.3%) 42.1 ± 27.2	66 (61.7%) 41.9 ± 26.7
Charlson comorbidity score, n (%) Score 0–1 Score 2 Score > 2	64 (56.1%) 50 (43.9%) 0	60 (56.1%) 47 (43.9%) 0
See dentist (hardly), n (%)	108 (94.7%)	100 (93.5%)
Days of drain tube, mean ± SD	4.9 ± 2.1	5.0 ± 2. 0
Days in hospital, mean ± SD	21 ± 6.9	20.9 ± 7.1

PD, probing depth; CAL, clinical attachment level; BOP, bleeding on probing; SUP, suppuration; GI, gingival index; FVC, forced vital capacity; FEV1, forced expiratory volume; DLCO, diffusing capacity for carbon monoxide.

Every parameter with mean ± SD has no significant difference between the groups by t‐test (P > 0.05).