Table 1 The target age distribution of this study covers the city district and two additional districts and the number of samples collected for each district.

Age group (year)	Expect Number of participants from each province		Ayutthaya			Buriram			Uttaradit			Trang
Age group (year)	City district	Additional district	City district	Nakornluang	Sena	City district	Lahan Sai	PrakhonChai	City district	Thong Saen Khan	Faktha	City district	Palian	Na Yong
6 month 2 years	55	55	54	33	28	63	29	28	55	32	28	55	35	27
3–4	55	55	58	26	29	52	25	28	53	25	27	56	29	23
5–6	55	55	51	28	26	53	30	31	59	27	28	57	30	31
7–8	55	55	61	24	31	54	27	27	59	29	29	52	20	24
9–10	55	55	51	31	27	54	29	28	49	26	26	56	30	25
11–12	44	44	46	28	23	43	21	21	46	23	24	45	24	29
13–14	44	44	43	18	23	42	22	21	43	20	21	46	21	21
15–16	44	44	44	25	21	43	25	21	43	25	22	41	21	23
17–18	44	44	42	19	22	47	21	23	45	22	25	49	22	23
19–20	44	44	49	22	22	45	19	20	48	23	22	36	21	18
21–30	132	132	127	58	66	124	66	65	127	63	65	127	58	57
31–40	52	52	53	26	26	52	27	26	52	28	26	53	25	22
41–50	28	28	27	17	14	29	14	17	28	15	15	29	15	23
51–60	28	28	29	14	13	31	14	15	31	14	13	27	12	18
61–80	24	24	24	10	13	24	12	10	21	12	12	24	12	11
Total	759	759	759	379	384	756	381	381	759	384	383	753	375	375

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