Table 4: Psychometric properties of the osteoporosis knowledge test-Arabic version (OKT-A) by item analysis (N=300).

Question
Number
Difficulty
Index
Point Biserial
Correlation*
Cronbach’s alpha
if item deleted
Question 1 0.463 0.345 0.766
Question 2 0.383 0.326 0.767
Question 3 0.228 0.261 0.770
Question 4 0.247 0.281 0.769
Question 5 0.444 0.244 0.772
Question 6 0.574 0.297 0.769
Question 7 0.272 0.362 0.765
Question 8 0.475 0.402 0.762
Question 9 0.685 0.333 0.768
Question 10 0.642 0.432 0.762
Question 11 0.537 0.445 0.758
Question 12 0.463 0.354 0.766
Question 13 0.531 0.373 0.764
Question 14 0.333 0.297 0.769
Question 15 0.772 0.413 0.761
Question 16 0.284 0.289 0.769
Question 17 0.852 0.232 0.772
Question 18 0.654 0.105 0.776
Question 19 0.685 0.230 0.772
Question 20 0.809 0.282 0.769
Question 21 0.272 0.275 0.770
Question 22 0.105 0.404 0.762
Question 23 0.309 0.241 0.771
Question 24 0.543 0.261 0.770

* Give corrected item-total correlation