Adjusted segmented regression of hemoglobin A1c before the Ontario Health Insurance Plan (OHIP)+ program began (Jan. 1, 2016, to Dec. 31, 2017) and during OHIP+ (Apr. 1, 2018, to Mar. 31, 2019) to evaluate whether temporal trends changed between time periods (n = 6347 youth; n = 32 802 measurements of hemoglobin A1c)
| Variable | β estimate (95% CI) |
|---|---|
| Mean HbA1c on Jan. 1, 2016, by deprivation quintile | |
| Q1 (least deprived)* | 8.4718 (8.3752 to 8.5684) |
| Q2 | 8.6783 (8.5693 to 8.7872) |
| Q3 | 8.6464 (8.5393 to 8.7535) |
| Q4 | 8.8280 (8.7020 to 8.9541) |
| Q5 (most deprived) | 8.9478 (8.8191 to 9.0764) |
| Slope (change in HbA1c per 90 d) (before OHIP+) | 0.0037 (−0.0033 to 0.0107) |
| Change in slope from before OHIP+ to after Apr. 1, 2018 | −0.0002 (−0.0004 to 0.0000) |
| Age (centred on 14 yr) | 0.0039 (−0.0078 to 0.0157) |
| Male | −0.0564 (−0.1427 to 0.0300) |
| Duration of diabetes (centred on 7 yr) | 0.0417 (0.0293 to 0.0541) |
Note: CI = confidence interval, HbA1c = hemoglobin A1c.
↵* Reference category.