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
| 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 |
Refer to the definition listed under data analysis (a) – (c) for column labels:
aNumber of participants with any missing OHIP items divided by the total number of participants
bNumber of missing items divided by the total number of items among all participants
cNumber of missing items divided by the total number of items among participants with any missing OHIP items
†Median split is applied