Scales to Assess Knowledge, Motivation, and Self-Efficacy for HIV PrEP in Colombian MSM: PrEP-COL Study
Table 2
Item response analysis—PrEP knowledge scale.
Item
Difficulty parameters
Chi sq
df
value
Outfit MSQ
Infit MSQ
Outfit t
Infit t
Discrim
PrEP is a daily pill you can take to reduce your risk of becoming infected with HIV
0
168.769
200
0.947
0.840
0.899
−0.923
−1.056
0.35
You should not use PrEP if you don’t know your HIV status +
1.969
170.56
200
0.935
0.849
0.925
−1.503
−1.178
0.397
If you do not take PrEP consistently, there may not be enough medicine in your bloodstream to block the HIV virus
0.965
207.431
200
0.344
1.032
0.984
0.348
−0.226
0.327
PrEP can be used to prevent STIs like gonorrhea, chlamydia, syphilis, herpes, and HPV
0.329
191.344
200
0.658
0.952
0.952
−0.296
−0.560
0.327
If you start taking PrEP, you will have to take it for the rest of your life
0.965
224.213
200
0.115
1.098
1.098
1.141
1.455
0.163
PrEP can be taken by people who already have HIV
2.208
236.976
200
0.038
1.043
1.043
1.477
0.646
0.169
You must take an HIV test every 3 months while taking PrEP +
1.831
193.298
200
0.620
0.994
0.994
−0.364
−0.079
0.301
There are many serious side effects of taking PrEP +
2.622
196.265
200
0.561
1.030
1.030
−0.108
0.398
0.206
The PrEP pill contains two medicines that are also used to treat HIV +
2.135
167.826
200
0.953
0.867
0.867
−1.510
−2.063
0.446
Daily PrEP use can lower the risk of getting HIV from sex by more than 90%
0.244
146.976
200
0.998
0.870
0.870
−1.936
−1.553
0.437
The difficulty parameter of this item had been fixed to 0. Items of the scale had a bad fit. +Items of the scale show a high degree of difficulty and did not show acceptable discrimination.
