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Table 2 Results of the IRT analysis in the knowledge section of validation study 1 (n = 214)

From: Development and validation of a new knowledge, attitude, belief and practice questionnaire on leptospirosis in Malaysia

Items b (SE) a (SE) λ χ2 (df = 8) P values
K1 Penyakit kencing tikus juga dikenali sebagai penyakit leptospirosis (Rat urine disease is also known as leptospirosis) −0.66 (0.19) 0.93 (0.21) 0.68 14.20 0.077
K2 Penyakit kencing tikus disebabkan oleh kuman (Rat urine disease is caused by germs) −1.50 (0.25) 1.35 (0.29) 0.80 5.75 0.675
K3 Penyakit kencing tikus adalah penyakit haiwan yang boleh menjangkiti manusia (Rat urine disease is an animal disease that can infect humans) −1.61 (0.32) 1.07 (0.25) 0.73 23.20 0.003
K4 Penyakit kencing tikus boleh dikesan melalui ujian darah (Rat urine disease can be detected through blood tests) −1.80 (0.30) 1.40 (0.32) 0.81 7.75 0.459
K5 Kuman penyakit kencing tikus boleh memasuki badan manusia melalui: (Rat urine disease can enter the human body through:)
K5i Luka pada anggota badan (wounds on limbs) −0.03 (0.07) 3.05 (0.52) 0.95 14.62 0.067
K5ii Mata (eyes) 0.12 (1.64) 23.64 (330.54) 1.00 4.62 0.798
K5iii Hidung (nose) 0.10 (0.05) 6.70 (1.93) 0.99 16.18 0.040
K5iv Mulut (mouth) −0.16 (0.07) 3.13 (0.56) 0.95 14.15 0.078
K5v Makanan yang tercemar (contaminated foods) −1.48 (0.20) 1.98 (0.42) 0.89 17.07 0.029
K5vi Minuman yang tercemar (contaminated drinks) −1.61 (0.23) 1.79 (0.39) 0.87 28.35 < 0.001
K5vii Bersalaman dengan pesakit penyakit kencing tikus (shaking hands with rat urine disease patient) 0.50 (0.46) 0.36 (0.16) 0.34 32.30 < 0.001
K6 Pesakit kencing tikus akan mengalami tanda-tanda berikut: (Rat urine disease patients will experience following symptoms:)
K6i Demam (Fever) −1.39 (0.18) 2.34 (0.51) 0.92 8.30 0.404
K6ii Sakit-sakit badan (Muscle Pains) −1.27 (0.16) 2.30 (0.50) 0.92 6.95 0.542
K6iii Mata kuning (jaundis) (Yellow eyes (jaundice)) 0.27 (0.16) 1.01 (0.21) 0.71 8.68 0.370
K7 Penyakit kencing tikus boleh mengakibatkan: (Rat urine disease patients may result in:)
K7i Kematian (Death) −2.96 (0.68) 1.59 (0.56) 0.85 4.07 0.851
K7ii Masalah pernafasan (Respiratory problems) −0.65 (0.10) 2.42 (0.42) 0.92 22.06 0.005
K7iii Kegagalan buah pinggang (Kidney failure) 0.11 (0.10) 1.77 (0.30) 0.87 17.40 0.026
K7iv Kerosakan hati (Damage to the liver) 0.19 (0.10) 1.95 (0.33) 0.89 20.71 0.008
K8 Penyakit kencing tikus boleh dicegah dengan: (Rat urine disease can be prevented by:)
K8i Pastikan persekitaran rumah bersih daripada sampah (Make sure home environment is clean from garbage) −3.25 (0.89) 1.37 (0.53) 0.81 7.06 0.531
K8ii Elak diri dari mengharung air banjir (Avoid wading through floods) −1.77 (0.31) 1.27 (0.29) 0.79 13.01 0.112
K8iii Jaga kebersihan diri (Keep personal hygiene) −2.85 (0.69) 1.23 (0.40) 0.78 11.37 0.181
K8iv Minum air yang bersih (Drink clean water) −3.29 (0.94) 1.26 (0.49) 0.78 19.34 0.013
K8v Pakai sarung tangan getah semasa bekerja (Wear rubber gloves at work) − 1.95 (0.45) 0.86 (0.23) 0.65 12.79 0.119
K8vi Elak mandi di kawasan air terjun/lata/jeram/sungai/tasik/tali air yang tercemar (Avoid bathing in contaminated waterfalls/ rapids/rivers/lakes/waterways) −2.79 (0.61) 1.46 (0.47) 0.83 10.55 0.229
  1. a discrimination, b difficulty, df degree of freedom, IRT item response theory, SE standard error, χ2 chi-square, λ standardized loading
  2. Items with P values < 0.05 in the assessment of the item fit are highlighted in bold