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Table 2 Baseline characteristics of the study population and forest workers

From: Epidemiology of forest malaria in central Vietnam: a large scale cross-sectional survey

Study population, n = 4,306 N (%) 95%CI
Sex:   
   - Male 1,841 (42.8) [40.7; 44.8]
   - Female 2,465 (57.2) [55.2; 59.3]
Age categories:   
   - 10–19 y 959 (22.3) [21.0; 23.6]
   - 20–29 y 1,494 (34.7) [33.4; 36.0]
   - 30–39 y 972 (22.6) [20.9; 24.3]
   - 40–49 y 539 (12.5) [11.4; 13.7]
   - >50 y 342 (7.9) [6.5; 9.4]
Ethnic groups:   
   - Rag Lay 3,705 (86.0) [83.1; 89.0]
   - Kinh 227 (5.3) [3.0; 7.5]
   - Ko'ho 349 (8.1) [3.9; 12.3]
   - Others (Cham, Ede, Chu,) 25 (0.6) [0.3; 0.9]
Education level:   
   - None 1,968 (45.7) [42.4; 49.0]
   - Primary school 1,849 (42.9) [40.0; 45.9]
   - Secondary school or university 489 (11.6) [9.4; 13.3]
Bed-net coverage, median [range] 2.5 pers/net [0.2; 11]
Bed-net categories:   
   - No net 92 (2.1) [1.1; 3.2]
   - Untreated nets 22 (0.5) [0; 1.1]
   - >2 pers./net (treated) 2,761(64.1) [60.3; 68.0]
   - 1–2 pers./net ( " ) 1,431(33.2) [29.4; 37.1]
House structure:   
   - Thatched bamboo 2,183 (50.7) [45.3; 56.1]
   - Wooden boards 1,224 (28.4) [23.4; 33.4]
   - Dried mud 236 (5.5) [2.9; 8.0]
   - Bricks 663 (15.4) [12.7; 18.1]
Socio economic level:   
   - No radio, no TV, no motorbike 2,742 (63.7) [58.8; 68.5]
   - Only radio (no TV, no moto) 448 (10.4) [8.7; 12.1]
   - TV (+/-radio) 461 (10.7) [8.3; 13.1]
   - Motorbike (+/- radio or TV) 655 (15.2) [12.0; 18.4]
Profession:   
   - Forest work (farming & other) 3,412 (79.2) [76.1; 82.3]
   - Other (rice farmer, teacher, health staff...) 441 (10.2) [7.4; 13.1]
   - None (children, students, retired people) 453 (10.5) [9.1; 12.0]
Forest workers, n = 3,412
Type of forest activity:   
   - Farming 3,395 (99.5) [99.2; 99.8]
   - Exploitation forest products (fishing, hunting, etc...) 15 (0.4) [0.1; 0.7]
   - Other (cow breeding, guardian) 2 (0.06) [0; 0.1]
Median number of days/month spent in forest: 27 range [0;30]
Sleeping in the forest:   
   - Yes 1,003 (29.4) [24.0; 34.8]
   - No 2409 (70.6) [65.2; 76.0]
Median number of nights/month spent in forest (n = 1003): 12 range [1; 30]
Sleeping place in the forest:   
   - Outside 112 (11.2) [5.1; 17.2]
   - Plot huts 891 (88.8) [82.8; 94.9]
Using hammocks when sleeping in forest:   
   - Yes (hammock nets = 27) 85 (8.5) [4.8; 12.2]
   - No 918 (91.5) [87.8; 95.2]
Using preventive an/or standby treatment when going to forest:   
   - Yes 80 (2.3) [0.8; 3.9]
   - No 3332 (97.7) [96.1; 99.2]
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