Table 5

Proportion of participants misclassified across reported caffeinated cups compared with coffee unit standardised cups a day (where 1 unit=227 mL instant coffee)

Volume and preparation type (coffee unit) standardised cups a day	Reported cups a day
	0	1	2	3	4	5	6	7	8	9	10	Total
0	13.74	0.41										14.15
1	0.13	34.53	1.13									35.79
2		5.89	15.84	1.45	0.10							23.27
3		0.53	5.99	5.08	0.28	0.11						11.98
4			1.31	2.76	2.39	0.47	0.03					6.95
5			0.31	0.74	1.04	1.11	0.19					3.38
6			0.01	0.39	0.36	1.01	0.55	0.21	0.21	0.03		2.77
7				0.02	0.28	0.10	0.19	0.13	0.02			0.73
8			0.01		0.11	0.10		0.02		0.14		0.38
9				0.12	0.08	0.02		0.02	0.11			0.35
10						0.07					0.02	0.09
≥11						0.05				0.09		0.14
≥2 cups over					0.10	0.11	0.03		0.21	0.03		0.49
1 cup over		0.41	1.13	1.45	0.28	0.47	0.19	0.21	0.02	0.14		4.29
No misclassification	13.74	34.53	15.84	5.08	2.39	1.11	0.55	0.13		0.02	73.37
1 cup under	0.13	5.89	5.99	2.76	1.04	1.01	0.19	0.02	0.11			17.13
≥2 cups under		0.53	1.65	1.27	0.83	0.34		0.02		0.09		4.72
Total	13.87	41.35	24.60	10.55	4.63	3.04	0.96	0.38	0.34	0.26	0.02	100.00
% misclassified*	0.94	16.5	35.6	51.8	48.44	63.55	42.60	65.75	100	100	0.00
Base (unweighted)	237	649	383	177	87	53	18	10	3	5	1	1623

No misclassification, 1 cup misclassification and ≥2 cups misclassification.
*Within corresponding reported cups a day column.