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Table 1 Results of the content validity indexes for the SAS questionnaire

From: The validity and reliability of Persian version of smartphone addiction questionnaire in Iran

Subscale Question CVR Simplicity CVI Appropriateness CVI certainty CVI
Daily life disturbance (q1-q5) Missing planned work due to smartphone use 1 1 1 1
Having a hard time concentrating in class, while doing assignments, or while working due to smartphone use 0.8 0.8 0.8 0.8
Experiencing lightheadedness or blurred vision due to excessive smartphone use 0.8 1 1 1
Feeling pain in the wrists or at the back of the neck while using a smartphone 1 1 1 1
Feeling tired and lacking adequate sleep due to excessive smartphone use 1 1 1 1
Positive anticipation (q6-q13) Feeling calm or cozy while using a smartphone 0.8 1 1 1
Feeling pleasant or excited while using a smartphone 0.8 1 1 1
Feeling confident while using a smartphone 0.8 1 0.6 1
Being able to get rid of stress with a smartphone 0.8 1 0.8 1
There is nothing more fun to do than using my smartphone. 0.8 1 1 1
My life would be empty without my smartphone. 0.8 1 1 1
Feeling most liberal while using a smartphone 0.6 0.8 1 1
Using a smartphone is the most fun thing to do. 1 1 1 1
Withdrawal (q14-q19) Won’t be able to stand not having a smartphone 0.8 1 0.8 1
Feeling impatient and fretful when I am not holding my smartphone 0.8 1 1 1
Having my smartphone in my mind even when I am not using it 0.8 0.8 0.8 1
I will never give up using my smartphone even when my daily life is already greatly affected by it. 1 0.8 1 0.8
Getting irritated when bothered while using my smartphone 0.6 1 0.8 1
Bringing my smartphone to the toilet even when I am in a hurry to get there 0.8 0.8 0.8 1
Cyberspace oriented relationship (q20-q26) Feeling great meeting more people via smartphone use 0.6 0.8 0.8 1
Feeling that my relationships with my smartphone buddies are more intimate than my relationships with my real-life friends 0.6 0.8 0.8 1
Not being able to use my smartphone would be as painful as losing a friend. 0.8 1 1 1
Feeling that my smartphone buddies understand me better than my real-life friends 0.8 1 0.8 1
Constantly checking my smartphone so as not to miss conversations between other people on Telegram or Instagram 1 1 1 1
Checking SNS (Social Networking Service) sites like Telegram or Instagram right after waking up 1 1 1 1
Preferring talking with my smartphone buddies to hanging out with my real-life friends or with the other members of my family 1 0.8 1 1
Overuse (q27-q30) Preferring searching from my smartphone to asking other people 0.8 1 0.8 1
My fully charged battery does not last for one whole day. 0.8 1 1 1
Using my smartphone longer than I had intended 0.8 0.8 0.8 1
Feeling the urge to use my smartphone again right after I stopped using it 1 1 0.8 1
Tolerance (q31-q33) Having tried time and again to shorten my smartphone use time, but failing all the time 1 1 1 1
Always thinking that I should shorten my smartphone use time 1 1 1 1
The people around me tell me that I use my smartphone too much. 1 1 1 1