Effect of swimming initiation period and continuation frequency on motor competence development in children aged up to 3 years: the Japan environment and children’s study

Table 4 Associations between each level of the frequency of pool use and the development of gross motor function

Time	Levels of swimming pool use frequency	1.5 years				2 years				2.5 years				3 years
		aOR^c	95% CI^d			aOR	95% CI			aOR	95% CI			aOR	95% CI
			lower		upper		lower		upper		lower		upper		lower		upper
T1^a	Seldom (reference)	―	―		―	―	―		―	―	―		―	―	―		―
	Once per month	0.59	(0.52	-	0.68)	0.88	(0.78	-	1.00)	0.70	(0.61	-	0.80)	0.78	(0.68	-	0.89)
	2–3 times per month	0.70	(0.60	-	0.81)	0.88	(0.78	-	0.99)	0.75	(0.66	-	0.87)	0.83	(0.72	-	0.95)
	Once per week	0.70	(0.57	-	0.85)	0.79	(0.67	-	0.93)	0.72	(0.59	-	0.87)	0.78	(0.64	-	0.95)
	≥ 2 times per week	0.72	(0.62	-	0.84)	0.71	(0.62	-	0.81)	0.56	(0.46	-	0.67)	0.70	(0.60	-	0.82)
T2^b	Seldom (reference)	―	―		―	―	―		―	―	―		―	―	―		―
	Once per month	―	―		―	1.02	(0.87	-	1.21)	0.82	(0.69	-	0.97)	0.90	(0.76	-	1.07)
	2–3 times per month	―	―		―	1.10	(0.94	-	1.28)	0.83	(0.66	-	1.04)	0.93	(0.76	-	1.12)
	Once per week	―	―		―	0.84	(0.70	-	1.00)	0.82	(0.66	-	1.01)	0.86	(0.71	-	1.05)
	≥ 2 times per week	―	―		―	0.93	(0.81	-	1.07)	0.96	(0.82	-	1.13)	0.88	(0.75	-	1.03)

^aT1 refers to the questionnaire conducted at age 1.5 years, asking about the frequency of pool use from age 1 to 1.5 years
^bT2 refers to the questionnaire conducted at the age of 3 years, asking about the frequency of pool use from age 2 to 3 years
^caOR, adjusted odds ratio; ^d95% CI, 95% confidence intervals
Bold values indicate statistically significant results (p < 0.05)

ISSN: 2052-1847