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Table 3 Results of the IRT analysis in the knowledge section in validation study 2 (n = 759)

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) 0.88 (0.16) 0.71 (0.1) 0.58 28.60 < 0.001
K2 Penyakit kencing tikus disebabkan oleh kuman (Rat urine disease is caused by germs) −0.67 (0.09) 1.20 (0.13) 0.77 35.02 < 0.001
K3 Penyakit kencing tikus adalah penyakit haiwan yang boleh menjangkiti manusia (Rat urine disease is an animal disease that can infect humans) −0.73 (0.09) 1.22 (0.13) 0.77 26.76 0.001
K4 Penyakit kencing tikus boleh dikesan melalui ujian darah (Rat urine disease can be detected through blood tests) −0.37 (0.08) 1.17 (0.12) 0.76 16.23 0.039
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) −0.04 (0.05) 2.11 (0.20) 0.90 35.63 < 0.001
K5ii Mata (eyes) 0.52 (0.04) 6.11 (0.74) 0.99 18.90 0.015
K5iii Hidung (nose) 0.38 (0.05) 6.45 (0.73) 0.99 28.73 < 0.001
K5iv Mulut (mouth) 0.15 (0.04) 5.14 (0.62) 0.98 36.24 < 0.001
K5v Makanan yang tercemar (contaminated foods) −0.61 (0.06) 2.24 (0.24) 0.91 33.63 < 0.001
K5vi Minuman yang tercemar (contaminated drinks) −0.63 (0.06) 2.30 (0.25) 0.92 38.73 < 0.001
K5vii Bersalaman dengan pesakit penyakit kencing tikus (shaking hands with rat urine disease patient) 0.85 (0.16) 0.69 (0.10) 0.57 46.87 < 0.001
K6 Pesakit kencing tikus akan mengalami tanda-tanda berikut: (Rat urine disease patients will experience following symptoms:)
K6i Demam (Fever) −1.07 (0.08) 2.19 (0.22) 0.91 38.43 < 0.001
K6ii Sakit-sakit badan (Pain) −0.71 (0.09) 1.33 (0.13) 0.80 81.48 < 0.001
K6iii Mata kuning (jaundis) (Yellow eyes (jaundice)) 0.52 (0.09) 1.17 (0.13) 0.76 33.82 < 0.001
K7 Penyakit kencing tikus boleh mengakibatkan: (Rat urine disease patients may result in:)
K7i Kematian (Death) −1.50 (0.14) 1.22 (0.14) 0.77 24.83 0.002
K7ii Masalah pernafasan (Respiratory problems) 0.32 (0.10) 0.85 (0.11) 0.65 47.94 < 0.001
K7iii Kegagalan buah pinggang (Kidney failure) 0.23 (0.10) 0.80 (0.11) 0.63 29.95 < 0.001
K7iv Kerosakan hati (Damage to the liver) 0.38 (0.11) 0.76 (0.10) 0.60 34.10 < 0.001
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) −2.35 (0.32) 0.73 (0.11) 0.59 129.43 < 0.001
K8ii Elak diri dari mengharung air banjir (Avoid wading through floods) −1.69 (0.26) 0.63 (0.10) 0.53 75.66 < 0.001
K8iii Jaga kebersihan diri (Keep personal hygiene) −2.00 (0.26) 0.76 (0.11) 0.60 89.71 < 0.001
K8iv Minum air yang bersih (Drink clean water) −2.30 (0.31) 0.74 (0.11) 0.59 91.10 < 0.001
K8v Pakai sarung tangan getah semasa bekerja (Wear rubber gloves at work) −1.20 (0.20) 0.62 (0.09) 0.53 53.59 < 0.001
K8vi Elak mandi di kawasan air terjun/lata/jeram/sungai/tasik/tali air yang tercemar (Avoid bathing in contaminated waterfalls/ rapids/rivers/lakes/waterways) −2.09 (0.22) 1.05 (0.13) 0.72 14.97 0.060
  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