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Table 1 Data validation: reported and observed bednet usage among KHDSS residents by survey period and age categories

From: Trends in bednet ownership and usage, and the effect of bednets on malaria hospitalization in the Kilifi Health and Demographic Surveillance System (KHDSS): 2008–2015

 

Bednet observed in sero-survey among reported bednet users in KHDSS

Survey Period

Age group [years]

n

Proportion

Agreement [95% CI]

Gwet’s AC1

June – August 2009

0–4

283

88.5%

75.6% [70.2, 80.5]

0.59

5–15

312

78.0%

68.9% [63.5, 74.0]

0.40

Total

595

83.5%

72.1% [68.3, 75.7]

0.49

June – September 2011

0–4

172

82.9%

77.3% [70.3, 83.4]

0.60

5–15

199

79.8%

73.4% [66.7, 79.4]

0.48

Total

371

81.4%

75.2% [70.5, 79.5]

0.53

June – September 2013

0–4

161

98.6%

89.4% [83.6,93.7]

0.87

5–15

188

91.7%

83.0% [76.8, 88.1]

0.77

Total

349

94.9%

86.0% [81.9,89.4]

0.82

June – October 2015

0–4

149

92.8%

77.2% [69.6, 83.7]

0.67

5–15

155

79.3%

67.1% [59.1, 74.4]

0.37

Total

304

86.9%

72.0% [66.6,77.0]

0.52

Overall

0–4

765

90.7%

79.2% [76.2, 82.0]

0.68

5–15

854

82.6%

72.7% [69.6, 75.7]

0.50

  1. n number of individuals observed both in the KHDSS enumeration survey and sero-survey i.e. paired observations
  2. Proportion = number of individuals for whom bednet was observed in the sero-survey divided by the number of individuals who reported bednet use during the KHDSS enumeration survey
  3. CI confidence interval