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