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Table 1 Characteristics of subjects included in the study in Yaounde, Cameroun

From: Prevalence of obstructive lung disease in an African country using definitions from different international guidelines: a community based cross-sectional survey

Characteristics Overall n = 1287 (%) Men n = 619 (%) Women n = 668 (%) p
Age, years
 Mean (SD) 34.4 (12.8) 34.2 (13.1) 34.5 (12.4) 0.309
 Median (25th–75th percentiles) 30 (24–42) 30 (24–42) 31 (25–42) 0.312
 Min–Max 19–83 19–81 19–83 /
Age group, years
 19–39 911 (70.8) 446 (72.1) 465 (69.6) 0.124
 40–59 306 (23.8) 134 (21.6) 172 (25.7)  
 ≥60 70 (5.4) 39 (6.3) 31 (4.6)  
Level of education
 ≤secondary 854/1285 (66.5) 363/618 (58.7) 491/667 (73.6) <0.001
 Higher education 431/1285 (33.5) 255/618 (41.3) 176/667 (26.4)  
Subject/chamber
 ≤2 711/1281 (55.5) 384/617 (62.2) 327/664 (49.2) <0.001
 >2 570:1281 (44.5) 233:617 (37.8) 337/664 (50.8)  
Tobacco smoking
 Current smoker 120/1283 (9.4) 105/618 (17) 15/665 (2.3) <0.001
 Ex-smokers 87/1283 (6.8) 76/618 (12.3) 11/665 (1.7)  
 Non smokers 10/1283 (83.9) 437/618 (70.7) 639/665 (96.1)  
Cooking fuel
 Clean 557/1252 (44.5) 313/659 (52.8) 244/593 (37) <0.001
 Biomass 99/1252 (7.9) 3/659 (6.6) 60/593 (9.1)  
 Mixed 596/1252 (47.6) 241/659 (40.6) 355/593 (53.9)  
Past history of TB
 No 1266 (98.4) 608 (98.2) 658 (98.5) 0.692
 Yes 21 (1.6) 11 (1.8) 10 (1.5)  
Past history of pneumonia
 No 1250/1286 (97.2) 598/619 (48.1) 652/667 (97.8) 0.214
 Yes 36/1286 (2.8) 21/619 (3.4) 15/667 (2.2)  
HIV infection
 No 1005 (78.1) 456 (73.7) 549 (82.2) <0.001
 Yes 11 (0.9) 4 (0.6) 7 (1)  
 Don’t know 271 (21.1) 159 (25.7) 112 (16.8)  
Chronic cough
 No 1262 (98.1) 607 (98.1) 655 (98.1) 0.992
 Yes 25 (1.9) 12 (1.9) 13 (1.9)  
Chronic expectoration
 No 1277 (99.2) 614 (99.2) 663 (99.3) >0.999
 Yes 10 (0.8) 5 (0.8) 5 (0.7)  
Chronic dyspnea
 No 1229 (95.5) 602 (97.3) 627 (93.9) 0.003
 Yes 58 (4.5) 17 (2.7) 41 (6.1)  
Wheezes
 No 1198/1283 (93.4) 583/617 (48.1) 615/666 (92.3) 0.122
 Yes 85/1283 (6.6) 34/617 (5.5) 51/666 (7.7)  
 BMI, kg, mean(SD) 26.4 (5.4) 25.3 (4.3) 27.5 (6.1) <0.001
AFL–pre-LLN
 Yes 49 (3.8) 32 (5.2) 17 (2.5) 0.014
 No 1238 (96.2) 587 (94.8) 651 (97.5)  
AFL–fixed ratio
 Yes 9 (0.7) 6 (1) 3 (0.4) 0.263
 No 1278 (99.3) 613 (99) 665 (99.6)  
COPD–LLN
 Yes 31/1276 (2.4) 21/608 (3.5) 10/668 (1.5) 0.023
 No 1245/1276 (97.6) 587/608 (96.5) 587/668 (96.5)  
COPD–fixed-ratio
 Yes 7/1276 (0.5) 4 (0.7) 3 (0.4) 0.715
 No 1269/1276 (99.5) 604/608 (99.3) 665/668 (99.6)  
  1. SD standard deviation, HIV human immunodefiency virus, BMI body mass index, AFL airflow limitation, LLN lower limit of normal, COPD chronic obstructive pulmonary disease