Memory decline in older individuals predicts an objective indicator of oral health: findings from the Sydney Memory and Ageing Study

Table 5 Binary logistic regression estimating effect of cognitive function on sub-lingual resting saliva pH (SRSpH)

	Partially adjusted^a		Fully adjusted^b
	Odds Ratio (lower, upper 95% CI)	p value	Odds Ratio (lower, upper 95% CI)	p value
Wave 4
Composite global cognition	0.92 (0.68, 1.24)	0.600	0.88 (0.63, 1.22)	0.454
Attention/processing speed	1.09 (0.80, 1.49)	0.569	1.08 (0.76, 1.52)	0.655
Language	0.84 (0.64, 1.11)	0.225	0.79 (0.58, 1.08)	0.151
Executive function	0.99 (0.76, 1.30)	0.983	0.97 (0.73, 1.30)	0.874
Visuo-spatial	0.91 (0.68, 1.23)	0.577	0.93 (0.68, 1.28)	0.681
Memory	0.81 (0.59, 1.11)	0.197	0.75 (0.52, 1.06)	0.108
Change in cognitive function^{^}
Composite global cognition	0.87 (0.53, 1.42)	0.578	0.84 (0.50, 1.42)	0.537
Attention/processing speed	1.08 (0.73, 1.59)	0.686	1.17 (0.77, 1.79)	0.452
Language	0.97 (0.64, 1.47)	0.901	0.93 (0.59, 1.48)	0.782
Executive function	0.81 (0.55, 1.20)	0.308	0.80 (0.53, 1.21)	0.294
Visuo-spatial	0.94 (0.64, 1.39)	0.790	0.96 (0.63, 1.46)	0.869
Memory	0.65 (0.42, 1.00)	0.050^*	0.63 (0.40, 0.99)	0.046^*

If Odds Ratio (OR), OR > 1, (OR-1)*100% represents percentage increase in the odds of having acidic saliva pH per unit increase in standardised cognition score
If OR < 1, ((1/OR)-1)*100% represents percentage increase in the odds of having acidic saliva pH per unit decrease in standardised cognition score
CI_Confidence Interval
^aAdjusted for age, gender and years of education
^bAdjusted for age, gender, years of education, medical conditions, general health, depression, smoking, alcohol consumption, functionality and dental care utilization
^{^}Change in cognitive function = Score at Wave 4—Scores at Wave 1 (baseline)
^*p ≤ .05, ^**p < .01, ^***p < .001

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