Correction to: Comparative analysis of COPD associated with tobacco smoking, biomass smoke exposure or both.

In the original publication [1] is an error in table 1. The correct version can be found in this Erratum.

Correction

In the original publication [1] there is an error in the FEV1/FVC values found in Table 1. The correct version can be found in this Erratum.

Table 1

Demographic and clinical data

	Control Subjectsn = 52	TS COPDn = 49	BS COPDn = 31	TS + BS COPDn = 46
Sex, Male (%)/Female (%)	15(29) / 37(71)	35(71) / 14(29)	12(39) / 19(61)	26(63) / 20(37)
Age, years	70.34 ± 5.95	69.41 ± 8.69	72.29 ± 9.49	69.93 ± 7.19
Smoking history, pack-years	–	41.57 ± 25.62	–	55.46 ± 47.12
Biomass exposure, hour-years	–	–	340.90 ± 206.09	345.15 ± 193.16
Scolarship, years	13.21 ± 2.06	7.56 ± 4.25 a	5.20 ± 3.59 a, b	6.09 ± 3.93 a, b
BMI, kg/m2	30.09 ± 5.54	27.67 ± 5.08 a	26.57 ± 3.06 a	27.35 ± 5.69 a
Exacerbations in the previous year	–	1.10 ± 1.37	0.58 ± 0.42	0.69 ± 1.29
FEV1, % predicted	110.19 ± 17.46	56.88 ± 19.37 a, c	68.09 ± 32.30 a	53.79 ± 18.67 a, c
FEV1/FVC, %	84.46 ± 4.24	54.25 ± 11.17 a	58.39 ± 8.62 a	53.53 ± 12.35 a, c
DLCO, % predicted	81.52 ± 21.21	66.60 ± 19.82 a	73.73 ± 17.16	61.22 ± 24.98 a, c
Oxygen Saturation, %	96.91 ± 1.36	92.65 ± 4.55 a	93.94 ± 4.04 a	90.52 ± 4.90 a, b, c
6 MW, meters	492.48 ± 78.51	355.96 ± 163.02 a	375.29 ± 143.75 a	344.09 ± 161.12 a
mMRC	–	2.38 ± 1.47	2.37 ± 1.16	2.67 ± 1.03
CAT	–	15.49 ± 8.21	14.84 ± 6.69	13.18 ± 6.69
BODE	–	2.88 ± 5.71	2.71 ± 6.35	3.87 ± 7.72

Data presented as mean ± standard deviation, unless otherwise indicated. Definition of abbreviations: BMI body-mass index, FEV forced expiratory volume in 1 s, FVC forced vital capacity, DL carbon monoxide diffusing capacity, 6 MW 6 min walking test, mMRC modified Medical Research Council scale, CAT COPD assessment test, BODE Body-mass, airflow Obstruction, Dyspnea and Exercise index

aDifferent from control subjects (p < 0.05, by ANOVA)

bDifferent from TS COPD (p < 0.05, by ANOVA)

cDifferent from BS COPD (p < 0.05, by ANOVA)