Skip to main content

Table.2 general characteristics of study population

From: Spirometric reference equations for Cameroonians aged 4 to 89 years derived using lambda, mu, sigma (LMS) method

Parameters

Children (4–12 years)

Adolescents (13–18 years)

Adults (≥ 19 years)

Males, n

179

111

552

Age, years

 Range

4.95–11.95

12.01–18.73

19.01–87.16

 Mean (SD)

8.91 (1.77)

14.63 (1.73)

37.24 (15.45)

 Median (25–75th percentiles)

9.05 (7.58–10.29)

14.56 (13.16–15.79)

31.84 (24.89–46.07)

Height, cm

 Range

103–161

134–182

150–196

 Mean (SD)

131.65 (10.82)

160.04 (10.29)

172.13 (7.17)

 Median (25–75th percentiles)

132 (124–139)

160 (153–166.5)

172 (168–176)

Ethnicity

 Bantu, n (%)

168 (93.8)

104 (93.7)

415 (75.2)

 Soudano-sahelian, n (%)

11 (6.2)

7 (6.3)

105 (19.0)

 Mixed

32 (5.8)

FEV1, L

 Range

0.84–3.13

1.58–4.02

1.05–5.91

 Mean (SD)

1.51 (0.39)

2.72 (0.61)

3.26 (0.81)

 Median (25–75th percentiles)

1.50 (1.25–1.74)

2.69 (2.25–3.15)

3.29 (2.78–3.75)

FVC, L

 Range

0.86–3.34

1.76–4.58

1.28–7.51

 Mean (SD)

1.65 (0.45)

3.07 (0.70)

3.82 (0.90)

 Median (25–75th percentiles)

1.61 (1.34–1.93)

2.93 (2.56–3.61)

3.79 (3.32–4.40)

FEV1/FVC

 Range

0.75–1

0.77–0.99

0.65–1

 Mean (SD)

0.92

0.89 (0.05)

0.85 (0.07)

 Median (25–75th percentiles)

0.93 (0.88–0.97)

0.89 (0.86–0.92)

0.86 (0.81–0.90)

FEF25-75%, L/S

 Range

0.93–4.90

1.71–5.06

0.84–10.44

 Mean (SD)

2.06 (0.64)

3.23(0.82)

4.52(1.75)

 Median (25–75th percentiles)

2.03 (1.62–2.44)

3.22(2.61–3.94)

4.24(3.31–5.46)

Females, n

217

118

600

Age, years

 Range

4.45–11.98

12.02–18.67

19–88.13

 Mean (SD)

8.79(1.78)

15.33 (2.00)

38.09 (15.54)

 Median (25–75th percentiles)

8.89(7.40–10.16)

15.4 (13.40–17.24)

33.20 (24.67–49.31)

Height, cm

 Range

104–174

140–175

143–188

 Mean (SD)

132.20 (12.41)

158.30 (7.13)

162.43 (6.62)

 Median (25–75th percentiles)

130 (124–140)

158 (154–163)

162 (158–167)

Ethnicity

 Bantu, n (%)

203(93.5)

106 (89.8)

481 (80.2)

 Soudano-sahelian; n (%)

14(6.5)

12 (10.2)

68 (11.3)

 Mixed

51 (8.5)

FEV1, L

 Range

0.65–3.20

1.64–3.40

1.01–4.58

 Mean (SD)

1.48 (0.44)

2.56 (0.40)

2.42 (0.60)

 Median (25–75th percentiles)

1.42 (1.18–1.74)

2.55 (2.31–2.81)

2.46 (1.98–2.80)

FVC, L

 Range

0.70–3.58

1.82–3.81

1.13–5.19

 Mean (SD)

1.62 (0.49)

2.81 (0.45)

2.83 (0.66)

 Median (25–75th percentiles)

1.54 (1.27–1.89)

2.83 (2.50–3.13)

2.82 (2.40–3.24)

FEV1/FVC

 Range

0.79–1

0.78–1

0.65–1

 Mean (SD)

0.92 (0.05)

0.91 (0.07)

0.85 (0.07)

 Median (25–75th percentiles)

0.93 (0.88–0.97)

0.90 (0.87–0.94)

0.86 (0.80–0.91)

FEF25-75%, L/S

 Range

0.74–4.67

1.62–4.91

1–8.07

 Mean (SD)

0.92 (0.88–0.97)

3.21 (0.73)

3.57 (1.27)

 Median (25–75th percentiles)

0.93 (0.88–0.97)

3.21 (2.69–3.68)

3.42 (2.64–4.35)

  1. FEV1, forced expiratory volume in 1s (FEV1); FVC, forced vital capacity; FEF25-75%, forced mid-expiratory flow, SD: standard deviation