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Table 2 Characteristics of index cases and neighbors sleeping in the forest and farm in Phu Yen province, Vietnam, 2016

From: Targeting high risk forest goers for malaria elimination: a novel approach for investigating forest malaria to inform program intervention in Vietnam

Characteristics Category Index Case Neighbor Total POR (95% CI)
Sleeping in the forest   n = 54 (n, %) n = 39 (n, %) n = 93 (n, %)  
Bed or hammock net use
*more than one answer possible
- Do not use bed-nets or hammock nets
-Use untreated nets
Adjusted for education level
-Use treated bed-nets
Adjusted for education level
35 (64.8)
20 (37.0)
2 (3.7)
15 (38.5)
24 (61.5)
7 (17.9)
50 (53.8)
44 (47.3)
9 (9.7)
2.95 (1.26, 6.92)
0.37 (0.16, 0.86)
0.42 (0.17, 1.00)a
0.18 (0.03, 0.90)
0.10 (0.02, 0.58)a
Forest trips per year > 5 trips
5 trips or less
31 (57.4)
23 (42.6)
6 (15.4)
33 (84.6)
37 (39.8)
56 (60.2)
7.41 (2.66, 20.63)
Nights per trip in the forest 7 nights or less
>  7 nights
27 (50)
27 (50)
3 (7.7)
36 (92.3)
30 (32.3)
63 (67.7)
12.00 (3.29, 43.72)
Type of place for sleeping Hut without wall/outdoor
Hut with wall
48 (88.9)
6 (11.1)
6 (15.4)
33 (84.6)
54 (58.1)
39 (41.9)
44.00 (13.05, 148.33)
Main work in the forest Deep Forest: Aloe hunter, trapper, plantation and timber
Forest Fringe: Forest guard, trader, construction worker
42 (77.8)
12 (22.2)
9 (23.1)
30 (76.9)
51 (54.8)
42 (45.2)
11.67 (4.37, 31.18)
Work after dark Never
Sometimes
49 (90.7)
5 (9.3)
25 (64.4)
14 (35.9)
74 (79.6)
19 (20.4)
5.48 (1.84, 16.35)
Sleeping in the farm   n = 53 n = 151 n = 204  
Bed or hammock net use - Do not use bed-nets or hammock nets
- Use untreated nets
Adjusted for education level
- Use treated bed-nets
Adjusted for education level
23 (43.4)
21 (39.6)
13 (24.5)
67 (44.4)
50 (33.1)
56 (37.1)
90 (44.1)
71 (34.8)
69 (33.8)
0.96 (0.51, 1.81)
1.33 (0.69, 2.53)
0.55 (0.27, 1.12)
Forest trips per year > 5 trips
5 trips or less
37 (69.8)
16 (30.2)
87 (57.6)
64 (42.4)
124 (60.8)
80 (39.2)
1.70 (0.85, 3.32)
Nights per trip in the forest 7 nights or less
>  7 nights
36 (67.9)
17 (32.1)
95 (62.9)
56 (37.1)
131 (64.2)
73 (35.8)
1.25 (0.87, 2.43)
Type of place for sleeping Hut without wall/outdoor
Hut with wall
37 (69.8)
16 (30.2)
88 (53.3)
63 (41.7)
125 (61.3)
79 (38.7)
1.66 (0.85, 3.21)
Main work in the forest Deep Forest: Aloe hunter, trapper, plantation and timber
Forest Fringe: Forest guard, trader, construction worker
15 (28.3)
38 (71.7)
19 (12.6)
132 (87.4)
34 (16.7)
170 (83.3)
2.74 (1.27, 5.91)
Work after dark Never
Sometimes
26 (49.1)
27 (50.9)
60 (39.7)
91 (60.3)
86 (42.2)
118 (57.8)
1.46 (0.78, 2.73)
  1. POR prevalence odds ratio, CI confidence interval, aadjusted prevalence odds ratio