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Table 1 Baseline characteristics of the study population

From: Malaria in central Vietnam: analysis of risk factors by multivariate analysis and classification tree models

Study population, N = 18,646 n %
Sex (ratio = 0.98)   
   - Male 9,230 49.5
Age groups:   
   - < 10 y 5,026 27.0
   - 10–19 y 4,619 24.8
   - 20–39 y 5,351 28.7
   - 40–59 y 2,768 14.9
   - > 59 y 882 4.7
Ethnic groups:   
   - Ra-glai 16,438 88.2
   - K'ho 1,728 9.3
   - Kinh 454 2.4
   - Others (Chu, Cham, Ede) 26 0.1
Education level (age ≥ 20, n = 9,001):   
   - None 4,230 47.1
   - Primary school 4,101 45.6
   - Secondary school or higher 654 7.3
   - Missing 16 0.2
Occupation:   
   - None (children, students, retired people) 8,229 44.1
   - Forest work (farming & other) 9,868 52.9
   - Other (teacher, health staff...) 532 2.9
   - Missing 17 0.1
Bed net use in the village:   
   - Sleep under ITN 16,088 86.3
   - Sleep under an untreated bed net 1,310 7.0
   - Sleep without bed net 1,230 6.6
   - Missing 18 0.1
Forest activities:   
   - Never 7,864 42.2
   - Only during day 6,425 34.5
   - Work and sleep in the forest 4,340 23.3
   - Missing 17 0.1
Days/month spent in forest, median [range] (n = 10,728) 24 [1;30]
Nights/month spent in forest, median [range] (n = 4,340) 15 [1;30]
Bednet/hammock use in the forest (n = 4,340):   
   - Sleep under ITN 2,498 57.6
   - Sleep in a hammock 549 12.6
   - Sleep under ITN and hammock 635 14.6
   - Sleep without bed-net and hammock 658 15.2
Households N = 3,652 n %
House structure:   
   - Thatched bamboo 1,594 43.7
   - Wooden boards 1,006 27.6
   - Dried mud 496 13.6
   - Bricks 556 15.2
Socio economic level:   
   - No radio, TV, motorbike 1,437 39.4
   - Only a radio 1,160 31.8
   - Only TV 204 5.6
   - TV + radio (no moto) 268 7.3
   - At least a motorbike (+/-radio, TV) 583 16.0