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Table 5 IRT analysis of final 25 items retained in the knowledge section

From: Development and validation of a structured survey questionnaire on knowledge, attitude, preventive practice, and treatment-seeking behaviour regarding dengue among the resident population of Sabah, Malaysia: an exploratory factor analysis

Item Difficulty index Discrimination index Chi-square value P
K1
 K1.1 −5.24 0.66 10.34 0.242
 K1.2 −7.58 0.24 15.34 0.053
 K1.3 −3.15 0.36 10.59 0.226
 K1.12 1.31 0.61 10.36 0.241
 K1.13 1.81 0.73 5.99 0.648
K2 5.52 0.02 2.76 0.948
K3
K3.3 −7.33 0.54 6.36 0.607
K4
 K4.1 0.36 7.69 9.34 0.314
 K4.2 −5.86 0.44 13.23 0.104
 K4.3 0.37 9.37 9.19 0.327
 K4.4 0.34 10.66 6.08 0.638
K5
 K5.1 −3.68 0.47 43.14  < 0.001
 K5.2 0.08 1.93 39.16  < 0.001
 K5.3 0.57 1.73 41.63  < 0.001
 K5.4 0.48 1.60 44.05  < 0.001
K6
 K6.1 −4.67 0.38 11.57 0.172
 K6.4 −5.16 0.93 5.25 0.731
 K6.6 −3.11 0.38 14.60 0.067
 K6.7 −0.63 1.30 40.37  < 0.001
K7 3.29 0.44 4.47 0.813
K8
 K8.1 −1.72 0.52 18.09 0.021
 K8.2 −3.37 0.65 13.51 0.095
 K8.3 0.85 0.26 9.13 0.332
 K8.4 0.82 0.93 10.59 0.226
K11 −5.50 0.41 10.56 0.228
  1. Bold values indicate p < 0.05; statistically significant