Table 1. Proportion of nursery schools that participated in the survey.

Prefecture		Number of nursery schools		Proportion
Code	Name	Target (n = 23 711)	Participationb (n = 3624)
1	Hokkaido	855	139	16%
2	Aomori	470	108	23%
3	Iwatea	359	81	23%
4	Miyagia	346	132	38%
5	Akita	254	88	35%
6	Yamagata	241	42	17%
7	Fukushimaa	317	97	31%
8	Ibaraki	489	53	11%
9	Tochigi	353	79	22%
10	Gunma	418	62	15%
11	Saitama	993	164	17%
12	Chiba	790	142	18%
13	Tokyo	1855	204	11%
14	Kanagawa	1142	120	11%
15	Niigata	709	156	22%
16	Toyama	303	62	20%
17	Ishikawa	361	50	14%
18	Fukui	272	40	15%
19	Yamanashi	231	37	16%
20	Nagano	586	60	10%
21	Gifu	425	42	10%
22	Shizuoka	510	98	19%
23	Aichi	1209	237	20%
24	Mie	477	77	16%
25	Shiga	208	21	10%
26	Kyoto	481	23	5%
27	Osaka	1236	95	8%
28	Hyogo	893	77	9%
29	Nara	192	25	13%
30	Wakayama	210	10	5%
31	Tottori	191	29	15%
32	Shimane	286	45	16%
33	Okayama	403	106	26%
34	Hiroshima	615	132	21%
35	Yamaguchi	310	53	17%
36	Tokushima	216	13	6%
37	Kagawa	209	41	20%
38	Ehime	320	49	15%
39	Kochi	258	44	17%
40	Fukuoka	905	144	16%
41	Saga	248	23	9%
42	Nagasaki	438	67	15%
43	Kumamoto	587	88	15%
44	Oita	280	37	13%
45	Miyazaki	394	66	17%
46	Kagoshima	473	48	10%
47	Okinawa	393	18	5%

^aThe three prefectures that were most severely affected by the earthquake include Iwate, Miyagi, and Fukushima Prefectures.

^bWe defined participation as returning at least one questionnaire from Questionnaire “A,” Questionnaire “B1,” and Questionnaire “B2.”