Table 4.

Predicted values for HbA1c GBTM groups (both IFCC mmol/mol and NGSP %) for two scenarios. Scenario 1 has no periodontitis at any age. Scenario 2 has no periodontitis at age 26 and periodontitis at ages 32 and 38. Confidence intervals in parentheses. N = 784.

	HbA1c trajectory group
	Low	Medium	High
IFCC (mmol/mol)
Age 26
Scenario 1- No periodontitis at 26, 32 and 38	25.6 (24.6, 26.6)	29.6 (29.1, 30.1)	32.8 (32.4, 33.2)
Scenario 2 - Periodontitis at 32 and 38	25.6 (24.6, 26.6)	29.6 (29.1, 30.1)	32.8 (32.4, 33.2)
Age 32
Scenario 1- No periodontitis at 26, 32 and 38	28.3 (27.1, 29.4)	32.9 (32.3, 33.4)	36.2 (35.8, 36.6)
Scenario 2 - Periodontitis at 32 and 38	28.7 (27.3, 30.2)	33.1 (32.5, 33.7)	36.8 (36.2, 37.2)
Age 38
Scenario 1- No periodontitis at 26, 32 and 38	29.5 (28.5, 30.5)	33.7 (33.0, 34.2)	38.2 (37.7, 38.7)
Scenario 2 - Periodontitis at 32 and 38	30.0 (28.8, 31.2)	33.9 (33.2, 34.5)	38.7 (38.2, 39.3)
NGSP (%)
Age 26
Scenario 1- No periodontitis at 26, 32 and 38	4.5 (4.4, 4.6)	4.9 (4.8, 4.9)	5.2 (5.1, 5.2)
Scenario 2 - Periodontitis at 32 and 38	4.5 (4.4, 4.6)	4.9 (4.8, 4.9)	5.2 (5.1, 5.2)
Age 32
Scenario 1- No periodontitis at 26, 32 and 38	4.7 (4.6, 4.8)	5.2 (5.1, 5.2)	5.4 (5.4, 5.5)
Scenario 2 - Periodontitis at 32 and 38	4.8 (4.6, 4.9)	5.2 (5.1, 5.3)	5.5 (5.4, 5.5)
Age 38
Scenario 1- No periodontitis at 26, 32 and 38	4.9 (4.8, 5.0)	5.3 (5.2, 5.3)	5.6 (5.6, 5.7)
Scenario 2 - Periodontitis at 32 and 38	4.9 (4.8, 5.0)	5.3 (5.2, 5.3)	5.7 (5.6, 5.7)

Fully adjusted model includes time-invariant covariates sex, SES at 26, smoking at 26 and membership of the high waist-height group at 26, and time-varying covariate prevalence of periodontitis (as measured by prevalence of 1+ sites with 4+mm AL) at 32 and 38.