Table 3.

Agreement between baseline and usual^* skin carotenoid status quartiles, measured by resonance Raman spectroscopy at three time points (n 74)^†

	Usual carotenoid status*
Baseline carotenoid status	Q4	Q3	Q2	Q1	Total
Q4	13	5	0	0	18
Q3	5	8	6	0	19
Q2	0	6	10	3	19
Q1	0	0	3	15	18
Total	18	19	19	18	74

Q, quartile.

^*Mean skin carotenoid status in the palm measured at three time points; (baseline, 3-month and 6-month follow-up visits); Q4 is highest quartile.

^†Simple κ = 0.50 (95% CI 0.35, 0.64); weighted κ = 0.69 (95% CI 0.59, 0.80).