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Table 2 Prevalence of OHIP missingness (%) for the overall participants and for subsets of participants based on variables of interest in two studies with and without supervision

From: Is assessment of oral health-related quality of life burdensome? An item nonresponse analysis of the oral health impact profile

  Data collection without supervision Data collection with supervision
Participants with missing OHIP information a Missing items in all participants b Missing items in participants with missing OHIP information c Participants with missing OHIP information a Missing items in all participants b Missing items in participants with missing OHIP information c
Variables of interest
Item location
 First half of the questionnaire 13.4 2.3 17.1 5.2 0.3 5.9
 Second half of the questionnaire 8.5 2.5 29.0 5.4 0.3 6.3
Age
 Younger 11.3 1.0 8.7 6.8 0.2 3.1
 Older 23.1 3.7 16.2 11.9 0.4 3.4
Gender       
 Male 14.2 1.4 9.8 8.8 0.3 3.4
 Female 19.9 3.2 15.8 9.7 0.3 3.3
OHRQoL impairment
 Less 14.9 2.6 17.6 5.6 0.2 3.7
 More 20.4 2.1 10.4 13.2 0.5 3.4
  1. Refer to the definition listed under data analysis (a) – (c) for column labels:
  2. aNumber of participants with any missing OHIP items divided by the total number of participants
  3. bNumber of missing items divided by the total number of items among all participants
  4. cNumber of missing items divided by the total number of items among participants with any missing OHIP items
  5. Median split is applied