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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]