Socioeconomic disparities in orthodontic treatment outcomes and expenditure on orthodontics in England’s state-funded National Health Service: a retrospective observational study

Table 4 Missing outcome data by SES

IMD quintile (reference category: 5 [least deprived])	Mean percentage change
	Models 4 and 5: Incomplete IOTN outcome field				Model 6: Missing outcome record n = 24,501
	Among patients who completed n = 17899^a		Among patients who discontinued n = 1856^a		Model 6: Missing outcome record n = 24,501
	Unadjusted	Adjusted for IOTN AC, gender, age	Unadjusted	Adjusted for IOTN AC, gender, age	Unadjusted	Adjusted for IOTN AC, gender, age
1	−6.5	−6.9	0.8	0.7	3.0	3.0
2	−4.0	−4.2	−1.7	−2.3	2.4	2.3
3	−2.2	−2.4	−3.3	−3.3	1.9	1.8
4	−0.8	−0.9	−0.9	−0.5	1.9	1.9
Missing	−6.3	−6.5	2.6	1.6	0.7	1.1

AC Aesthetic Component, IMD Index of Multiple Deprivation, IOTN Index of Orthodontic Treatment Need
^aOnly patients with outcome records could be included (4746 had missing outcome records)

ISSN: 1472-6831