Table 3.

Age and gender in 4343 children with SCFE.

Study	Year	City/State/Country	Region	Race	Age	Age-M	Age-F	M	%M	F	%F
Stott and Bidwell [29]	2003	Auckland, New Zealand	Australia/NZ	All	11.82	12.46	11.05	115	54.5	96	45.5
				White	12.33	13.00	11.59	30	52.6	27	47.4
				Maori	11.51	12.18	10.69	33	55.0	27	45.0
				Pacific Islanders	11.65	12.24	10.92	49	55.1	40	44.9
Noguchi and Sakamaki [38]	2002	Japan	Asia	Indo-Malay (Japanese)	11.73	11.83	11.42	237	75.5	77	24.5
Jerre et al. [42]	1996	Gothenburg, Sweden	Scandinavia	White	13.07	13.60	12.10	113	64.6	62	35.4
Henrikson [43]	1969	Gothenburg, Sweden	Scandinavia	White	12.91	13.50	11.80	53	65.4	28	34.6
Hägglund et al. [34]	1984	Southern Sweden	Scandinavia	White	12.86	12.20	14.40	372	69.9	160	30.1
Loder [30]	1996	Worldwide	Worldwide	White	12.95	13.60	12.10	435	56.7	332	43.3
				African	12.88	13.80	11.70	225	56.1	176	43.9
				Amerindian	12.80	13.40	11.90	164	60.3	108	39.7
				Indo-Malay	12.09	12.30	11.50	89	74.2	31	25.8
				NA/PI	11.85	12.00	11.70	17	50.0	17	50.0
				Indo-Med	12.99	13.20	11.00	19	90.5	2	9.5
				All	12.88	13.50	12.00	959	58.8	671	41.2
Aronson and Loder [45]	1992	Detroit, Michigan	North America	African	12.53	13.42	11.08	46	62.2	28	37.8
Ninomiya et al. [36]	1976	Eastern Japan	Asia	Indo-Malay (Japanese)	12.49	12.75	11.00	58	85.3	10	14.7
Loder et al. [46]	2006	Michigan and Indiana	North America	All	12.60			159	65.4	84	34.6
Lim et al. [33]	2008	Singapore	Asia	All	12.20	12.40	11.10	53	80.3	13	19.7
Bosch et al. [32]	2008	New Mexico	North America	All	12.20	12.50	11.50
Burrows [47]	1957	London, England	Europe		14.70	16.53	11.95	60	60.0	40	40.0
Carliozet al. [48]	1984	Paris, France	Europe		13.19	14.00	12.50	31	46.3	36	53.7
Aronson and Carlson [13]	1992	Detroit, Michigan	North America	All				31	70.5	13	29.5
Aronson et al. [49]	1992	Detroit, Michigan	North America	All	12.85	13.50	11.70	35	63.6	20	36.4
Carney et al. [26]	1991	Iowa	North America		12.98	13.40	11.30	99	79.8	25	20.2
Dreghorn et al. [50]	1987	Glasgow, Scotland	Europe		12.98	13.50	12.25	45	58.4	32	41.6
Kulick and Denton [51]	1982	New York	North America	All	12.62	13.00	12.00	58	61.7	36	38.3
Weiner et al. [35]	1984	Akron, Ohio	North America	All	13.05	13.40	12.20	113	71.1	46	28.9
Koval et al. [52]	1989	New York	North America	All	12.10			37	61.7	23	38.3
Song et al. [44]	2009		South Korea	Indo-Malay	12.67	12.83	12.00	175	75.8	56	24.2
Averages					11.96	12.05	11.21	2806	64.3	1556	35.7

The averages are weighted to account for the number of children in each series. The overall age was used in those series where ages are given by ethnicity [29, 30].