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Table 1 Patient demographics and baseline characteristics by baseline SABA use

From: Salbutamol use in relation to maintenance bronchodilator efficacy in COPD: a prospective subgroup analysis of the EMAX trial

Characteristic

High baseline SABA (≥1.5 puffs/day)

Low baseline SABA (< 1.5 puffs/day)

UMEC/VI

(n = 415)

UMEC

(n = 401)

SAL

(n = 396)

Total (N = 1212)

UMEC/VI

(n = 395)

UMEC

(n = 399)

SAL

(n = 412)

Total (N = 1206)

Age, years, mean (SD)

63.8 (8.6)

63.8 (8.4)

63.1 (8.5)

63.5 (8.5)

65.6 (8.1)

66.0 (8.4)

65.6 (8.4)

65.7 (8.3)

Female, n (%)

168 (40)

179 (45)

182 (46)

529 (44)

149 (38)

146 (37)

159 (39)

454 (38)

Current smoker at screening, n (%)

205 (49)

222 (55)

233 (59)

660 (54)

187 (47)

171 (43)

180 (44)

538 (45)

Smoking pack-years, mean (SD)

49.6 (28.1)

48.1 (26.8)

46.8 (24.7)

48.2 (26.6)

49.3 (27.4)

47.4 (25.1)

49.4 (26.8)

48.7 (26.4)

Moderate COPD exacerbation history in prior yeara, n (%)

63 (15)

59 (15)

66 (17)

188 (16)

60 (15)

63 (16)

79 (19)

202 (17)

Duration of COPD, years, mean (SD)

9.0 (6.6)

8.1 (5.9)

9.0 (6.2)

8.7 (6.3)

8.5 (7.2)

7.6 (6.0)

7.6 (7.1)

7.9 (6.8)

No maintenance treatment during run-in, %

147 (35)

144 (36)

148 (37)

439 (36)

103 (26)

105 (26)

101 (25)

309 (26)

Post-salbutamol % predicted FEV1, mean (SD)

53.1 (13.1)

53.2 (12.6)

53.0 (12.9)

53.1 (12.8)

56.8 (12.2)

58.6 (12.2)

58.1 (12.2)

57.8 (12.2)

GOLD spirometric gradeb, n (%)

 2

240 (58)

233 (58)

221 (56)

694 (57)

277 (70)

294 (74)

300 (73)

871 (72)

 3

175 (42)

166 (42)

175 (44)

516 (43)

118 (30)

103 (26)

111 (27)

332 (28)

BDI score, mean (SD)

6.8 (1.9)

6.7 (2.0)

6.8 (1.9)

6.7 (1.9)

7.2 (1.8)

7.3 (1.8)

7.3 (1.7)

7.3 (1.8)

Baseline E-RS total score, mean (SD)

12.4 (5.5)

12.7 (5.8)

12.4 (5.6)

12.5 (5.6)

8.9 (5.1)

8.8 (5.2)

8.5 (5.2)

8.7 (5.2)

Baseline rescue salbutamol, puffs/day, mean (SD)

3.90 (2.5)

3.87 (2.2)

3.98 (2.4)

3.91 (2.39)

0.37 (0.4)

0.37 (0.4)

0.43 (0.5)

0.39 (0.45)

Baseline CAT score, mean (SD)

20.8 (5.9)

20.7 (6.3)

21.0 (6.7)

20.8 (6.3)

17.3 (5.4)

17.8 (5.7)

17.6 (5.5)

17.6 (5.5)

Baseline SGRQ total score, mean (SD)

48.9 (15.8)

49.1 (15.7)

49.9 (16.3)

49.3 (15.9)

39.8 (15.1)

40.9 (15.4)

39.5 (14.6)

40.1 (15.0)

Any vascular comorbidity, n (%)

233 (56)

217 (54)

218 (55)

668 (55)

209 (53)

215 (54)

230 (56)

654 (54)

Any cardiac comorbidity, n (%)

60 (14)

71 (18)

58 (15)

189 (16)

50 (13)

64 (16)

59 (14)

173 (14)

 Coronary artery disease

47 (11)

53 (13)

35 (9)

135 (11)

33 (8)

46 (12)

45 (11)

124 (10)

 Arrhythmia

17 (4)

23 (6)

19 (5)

59 (5)

18 (5)

21 (5)

17 (4)

56 (5)

 Congestive heart failure

6 (1)

8 (2)

11 (3)

25 (2)

6 (2)

9 (2)

8 (2)

23 (2)

  1. aNumber of exacerbations requiring oral or systemic corticosteroids and/or antibiotics (moderate) in 12 months prior to screening (patients with > 1 moderate exacerbation or with a severe exacerbation [requiring hospitalisation] were excluded); ban additional 4 (< 1%) patients with GOLD grade 1 were randomised (UMEC n = 3; SAL n = 1)
  2. BDI Baseline Dyspnoea Index, CAT COPD Assessment Test, COPD chronic obstructive pulmonary disease, E-RS Evaluating Respiratory Symptoms: COPD, FEV1 forced expiratory volume in 1 s, GOLD Global Initiative for Chronic Obstructive Lung Disease, ITT intent-to-treat, SD standard deviation, SABA short-acting β2-agonist, SAL salmeterol, SGRQ St George’s Respiratory Questionnaire, UMEC umeclidinium, VI vilanterol