Table 3. Associations between plasma zinc concentrations and glycaemic markers (Cameroon study).

	β-coefficient (95% confidence interval)			p-value for linear trend
	Tertile 1	Tertile 2	Tertile 3
Fasting glucose (mmol/L) (n=543)
Model 1	1.0 (ref)	-0.04(-0.29 to 0.21)	-0.20(-0.45 to 0.04)	0.10
Model 2	1.0 (ref)	-0.03(-0.27 to 0.20)	-0.18(-0.41 to 0.06)	0.14
Model 3	1.0 (ref)	-0.06(-0.29 to 0.17)	-0.25(-0.48 to - 0.01)	0.04
2-h glucose (mmol/L)
(n=536)	1.0 (ref)	-0.49(-0.86 to -0.12)	-0.63(-1.02 to - 0.23)	0.002
Model 1	1.0 (ref)	-0.47(-0.83 to -0.11)		0.007
Model 2	1.0 (ref)	-0.42(-0.77 to -0.07)	-0.54(-0.94 to - 0.15)	0.03
Model 3			-0.43(-0.82 to - 0.04)
HOMA-IR (n=540)
Model 1	1.0 (ref)	-0.07(-0.27 to 0.14)	-0.02(-0.24 to 0.19)	0.81
Model 2	1.0 (ref)	-0.02(-0.22 to 0.18)	0.07(-0.14 to 0.28)	0.53
Model 3	1.0 (ref)	-0.13(-0.30 to 0.05)	-0.23(-0.44 to - 0.03)	0.02

HOMA-IR, Homeostatic model assessment of insulin resistance

Model 1: Unadjusted

Model 2: Adjusted for age and sex,

Model 3: model 2 + smoking status, alcohol intake, education level, residential site (4 sites), body mass index (continuous) and objectively measured physical activity (continuous)