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Table 4 Characteristics of huts and activities among index cases and neighbors sleeping in at-risk sites of malaria, 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
(n = 110)
(n, %)
Neighbors (n = 197)
(n, %)
Total (n = 307)
(n, %)
POR (95% CI)
Year huts were established 1996–2006
2007–2016
9 (8.2)
101 (91.8)
24 (12.2)
173 (87.8)
33 (10.7)
274 (89.3)
0.64 (0.29, 1.44)
Duration from home to huts by motorbike
Additional time by walking
>  30 min
30 min or less
>  15 min
15 min or less
51 (46.4)
59 (53.6)
40 (36.4)
70 (63.6)
43 (21.8)
154 (78.2)
48 (24.4)
149 (75.6)
94 (30.6)
213 (69.4)
88 (28.7)
219 (71.3)
3.10 (1.87, 5.12)
1.77 (1.07, 2.94)
Number of people usually sleep in this hut in the last 12 months >  3 persons
3 or less
55 (50.0)
55 (50.0)
35 (17.8)
162 (82.2)
90 (29.3)
217 (70.7)
4.63 (2.74, 7.81)
Minimum number of people used to sleep (from 2 or more vs 1 person)   53 (48.2) 44 (22.4) 97 (31.7) 3.23 (1.96, 5.33)
Maximum number of people used to sleep (from > 5 vs 5 persons or less)   48 (43.6) 31 (15.8) 79 (25.8) 4.15 (2.42, 7.10)
Number of huts within 500 m radius of participants > 3 huts
0–3 huts
23 (20.9)
87 (79.1)
19 (9.6)
178 (90.4)
42 (13.7)
269 (86.3)
2.48 (1.29, 4.76)
Number of people within 500 m radius of participants >  6 neighbors
0–6 neighbors
22 (20.0)
88 (80.9)
22 (11.2)
175 (88.8)
44 (14.3)
263 (85.7)
1.99 (1.04, 3.79)
Duration from hut to nearest cell phone coverage by motorcycle Network available
30 min or less
30–120 min
61 (55.5)
18 (16.4)
31 (28.2)
162 (82.2)
22 (11.2)
13 (6.6)
223 (72.6)
40 (13.0)
44 (14.3)
0.27 (0.16, 0.45)
1.56 (0.80, 3.03)
5.55 (2.79, 11.07)
Drinking water sources usually be used Stream
Well
95 (86.4)
15 (13.6)
136 (69.0)
61 (31.0)
231 (75.2)
76 (24.8)
2.84 (1.54, 5.26)
  1. POR prevalence odds ratio, CI confidence interval