Table S1. Number of survey sites, individual samples, and composite samples in different PLADs.

PLADs	Number of survey sites	Number of individual samples												Number of composite samples
		Cereals	Legumes	Potatoes	Meats	Eggs	Dairy products	Aquatic foods	Vegetables	Fruits	Sugar	Beverages and water	Alcohols
Abbreviations: PLADs=provincial-level administrative divisions; TDS=Total Diet Study.
Sixth TDS	103	653	528	381	621	222	218	400	1,395	555	160	489	271	288
Heilongjiang	3	18	15	6	24	9	9	6	36	21	3	15	6	12
Jilin	3	24	15	6	15	6	3	6	39	18	3	9	6	12
Liaoning	3	21	15	9	18	6	6	18	39	21	3	21	6	12
Beijing	3	24	24	12	28	6	6	12	39	24	9	9	6	12
Shanxi	3	21	15	12	18	3	9	6	48	9	3	15	6	12
Hebei	6	42	30	30	36	12	18	18	84	42	12	30	12	12
Henan	6	36	30	24	30	6	6	30	72	24	12	18	18	12
Ningxia	3	21	15	12	18	3	6	9	42	12	3	15	3	12
Shaanxi	3	18	15	12	18	6	3	6	42	12	3	12	3	12
Inner Mongolia	3	15	12	6	9	3	6	6	39	15	6	12	6	12
Qinghai	3	18	12	6	15	3	6	6	39	15	3	3	3	12
Gansu	3	18	15	6	15	6	9	6	42	12	3	15	6	12
Fujian	3	21	18	12	18	9	6	18	45	21	3	12	9	12
Zhejiang	6	42	30	24	36	18	12	30	102	36	18	36	24	12
Jiangsu	6	36	36	30	42	12	12	30	78	30	3	30	24	12
Shanghai	6	36	30	24	48	12	18	42	72	36	24	30	24	12
Jiangxi	3	21	15	12	15	6	9	6	39	12	3	9	9	12
Shandong	6	36	36	18	36	12	12	30	84	36	12	30	18	12
Hubei	6	36	24	18	36	18	12	30	90	36	3	30	12	12
Sichuan	6	36	30	24	36	12	12	6	78	24	12	30	12	12
Hunan	6	36	24	30	42	18	12	30	84	30	6	30	12	12
Guangxi	3	24	15	18	15	9	6	15	42	9	3	21	9	12
Guangdong	7	35	42	21	35	21	14	28	84	42	7	42	28	12
Guizhou	3	18	15	9	18	6	6	6	36	18	3	15	9	12