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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