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Table 3 Item calibration, infit and outfit for the Final Malay QIRC

From: The Quality of Life Impact Refractive Correction (QIRC) questionnaire: validation of the Malay-translated version of the QIRC using Rasch analysis

Item no. Item description Item calibrationa (SE) Infit MnSq Outfit MnSq
1 How much difficulty do you have driving in glare conditions? 1.00 (0.07) 1.24 1.45
2 During the past month, how often have you experienced your eyes feeling tired or strained? 1.23 (0.05) 0.88 0.88
3 How much trouble is having to think about your spectacles/contact lenses/refractive surgery, e.g. LASIK, before doing things; (e.g. travelling, sport, going swimming)? 0.30 (0.07) 1.09 1.12
4 How much trouble is not being able to see when you wake up; (e.g. to go to the bathroom, look after a baby, see alarm clock)? 0.18 (0.07) 1.11 1.08
5 How much trouble is not being able to see when you are on the beach or swimming at the beach or pool, because you do these activities without spectacles or contact lenses? − 0.58 (0.07) 1.01 0.89
6 How much trouble is your spectacles or contact lenses when you wear them during exercises or sports activities? 0.74 (0.07) 1.03 1.02
7 How concerned are you about the initial and ongoing cost to buy your current spectacles/contact lenses/refractive surgery, e.g. LASIK? −0.17 (0.08) 0.84 0.80
8 How concerned are you about the cost of unscheduled maintenance of your spectacles/contact lenses/refractive surgery, e.g. LASIK; (e.g. breakage, loss, new eye problems)? −0.35 (0.08) 0.91 0.89
9 How concerned are you about having to increasingly rely on your spectacles or contact lenses since you started to wear them? −0.75 (0.06) 1.02 1.06
10 How concerned are you about your vision not being as good as it could be? −0.70 (0.06) 0.72 0.66
11 How concerned are you about medical complications from your choice of optical correction (spectacles, contact lenses and/or refractive surgery, e.g. LASIK)? −0.59 (0.08) 0.88 0.87
12 How concerned are you about eye protection from ultraviolet (UV) radiation? −0.32 (0.07) 1.21 1.33
13 During the past month, how much of the time have you felt that you have looked your best? −0.02 (0.07) 1.05 1.02
14 During the past month, how much of the time have you felt that you think others see you the way you would like them to (e.g. intelligent, sophisticated, successful, cool)? 0.47 (0.07) 1.15 1.10
15 During the past month, how much of the time have you felt complimented/flattered? 1.05 (0.06) 1.20 1.08
16 During the past month, how much of the time have you felt confident? −0.08 (0.07) 0.82 0.80
17 During the past month, how much of the time have you felt happy? −0.81 (0.05) 0.80 0.81
18 During the past month, how much of the time have you felt able to do the things you want to do? −0.35 (0.06) 1.00 0.97
19 During the past month, how much of the time have you felt eager to try new things? −0.26 (0.07) 1.09 1.02
  1. Items 1 to12 are functional scale; Items 13 to19 are emotional scale
  2. no. number, SE standard error, MnSq mean square, LASIK laser-assisted in situ keratomileusis
  3. aItem calibration in logit unit