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Table 2 Key baseline characteristics summarized across all study treatment groups (weighteda)

From: Rescue medication use as a patient-reported outcome in COPD: a systematic review and regression analysis

Characteristics

Patients evaluated

Population estimate

n (missing)

Mean (SD)

Median

Min–Max

N b

145 (0)

464 (6632)

403

6–1721

Age, years

138 (7)

63.5 (17.4)

63.6

58.8–68.1

Male, %

143 (2)

68.3 (153)

68

43–100

Mean duration of COPD, years

46 (99)

8.0 (37.9)

7.1

5.8–11.3

Current smokers, %

118 (27)

43.2 (127)

42.9

0–65.0

Mean of pack-years of cigarettes

71 (74)

45.2 (98.6)

44.0

34.8–58.5

Mean baseline trough FEV1 (L)

84 (61)

1.21 (3.65)

1.22

0.89–1.74

Mean % predicted FEV1

97 (48)

45.6 (129)

45.2

32.8–60.1

% GOLD grade 2

78 (67)

29 (540)

19

0–99.7

% GOLD grades 3 and 4

76 (69)

60 (640)

54

0–100

Mean baseline SGRQ score

70 (75)

49.4 (79.4)

48.2

38.4–58.6

Mean BDI score

38 (107)

6.3 (8.4)

6.4

5.1–7.0

  1. Abbreviations: BDI Baseline dyspnoea index, COPD chronic obstructive pulmonary disease, FEV 1 forced expiratory volume in one second, GOLD Global initiative for chronic Obstructive Lung Disease, SGRQ, St George’s Respiratory Questionnaire, SD standard deviation
  2. aThe statistics calculated take into account the treatment group sample size by applying weights to each of the characteristics described; the weight for each treatment group is proportional to its sample size
  3. bThe total number of patients randomized in all studies was 46,531