Characteristics of Relative Age Effects and Anthropometric Data in Japanese Recreational and Elite Male Junior Baseball Players

Sports Medicine - Open

Table 1 Distribution of all players divided into quartiles in each group

	Q1		Q2		Q3		Q4		Total	X ²	Effect size
	n	(%)	n	(%)	n	(%)	n	(%)	n		w
Elementary school	298	29.8	259	25.9	244	24.4	200	20.0	1001	19.27***	0.139
[Predicted]	251		250		250		250		1001
Junior high school	595	31.7	513	27.3	420	22.4	348	18.6	1876	74.32***	0.199
[Predicted]	469		469		469		469		1876
High school	529	33.3	483	30.4	318	20.0	257	16.2	1587	127.03***	0.283
[Predicted]	397		397		397		396		1587
NPB	764	34.1	669	29.9	458	20.5	347	15.5	2238	190.82***	0.292
[Predicted]	560		560		559		559		2238
MLB	290	29.2	238	24.0	236	23.8	228	23.0	992	9.71*	0.099
[predicted]	248		248		248		248		992

The number in the second row is the expected number of players obtained using the chi-square test
n number of players, X² chi-squared value
*p < 0.05; ***p < 0.001