Table 3.

Number of twin individuals, mean and standard deviation of height (cm) by birth order, age and sex in dizygotic twins

		Men					Women
	Birth order	N	Mean	p valuea	SD	p valueb	N	Mean	p valuea	SD	p valueb
Age 1	1	5088	74.8	0.051	4.11	0.531	4759	73.4	0.113	4.06	0.359
	2	4962	74.6		4.11		4821	73.2		4.14
Age 2	1	4184	87.4	0.340	4.22	0.265	3815	86.3	0.141	4.34	0.189
	2	4102	87.2		4.28		3871	86.1		4.27
Age 3	1	5407	96.6	0.074	4.43	0.822	5085	95.6	0.159	4.55	0.257
	2	5266	96.4		4.42		5208	95.4		4.62
Age 4	1	2993	102.4	0.873	5.27	0.872	2818	101.3	0.745	5.21	0.119
	2	2954	102.5		5.31		2848	101.1		5.25
Age 5	1	2349	112.0	0.126	6.07	0.478	2099	111.1	0.143	6.37	0.602
	2	2259	111.5		6.13		2189	110.7		6.41
Age 6	1	583	114.5	0.819	6.88	0.311	455	114.2	0.261	7.55	0.180
	2	552	114.8		7.15		469	113.6		7.39
Age 7	1	3986	124.8	0.232	6.59	0.266	3877	123.8	0.359	6.71	0.239
	2	3981	124.5		6.72		3864	123.8		6.65
Age 8	1	1478	129.2	0.533	6.42	0.154	1279	128.3	0.192	6.82	0.721
	2	1433	128.9		6.65		1318	127.9		6.87
Age 9	1	1445	134.5	0.664	7.30	0.271	1354	133.9	0.994	7.25	0.830
	2	1449	134.2		7.14		1316	133.9		7.38
Age 10	1	3171	141.8	0.097	7.02	0.226	2994	141.2	0.578	7.35	0.539
	2	3148	141.4		7.21		2973	141.0		7.39
Age 11	1	2385	145.2	0.130	7.23	0.505	2146	145.1	0.691	7.77	0.279
	2	2288	144.6		7.41		2153	145.4		7.92
Age 12	1	3152	152.5	0.945	7.82	0.617	3031	153.3	0.813	8.36	0.444
	2	3021	152.3		7.92		3048	153.3		8.24
Age 13	1	1035	158.8	0.887	8.77	0.051	898	158.4	0.938	7.80	0.964
	2	965	158.7		9.36		896	158.7		7.98
Age 14	1	2353	165.6	0.888	8.94	0.031	2332	162.8	0.358	6.74	0.529
	2	2266	165.8		8.62		2370	162.5		6.87
Age 15	1	1143	172.2	0.878	8.84	0.729	1042	165.4	0.547	7.18	0.358
	2	1078	172.3		8.87		1013	165.7		7.03
Age 16	1	1990	176.0	0.855	7.52	0.827	2086	165.4	0.952	6.61	0.174
	2	1940	175.8		7.46		2090	165.5		6.43
Age 17	1	2159	178.5	0.317	7.30	0.415	2230	166.4	0.758	6.32	0.035
	2	2092	178.0		7.16		2224	166.4		6.70
Age 18	1	1680	179.4	0.444	6.95	0.573	1281	166.8	0.434	6.77	0.267
	2	1614	179.2		6.91		1320	166.3		6.49
Age 19	1	1044	180.4	0.973	6.72	0.362	1099	167.2	0.662	6.60	0.187
	2	1049	179.8		6.86		1047	167.3		6.47
Age 20–29	1	4036	179.9	0.191	6.69	0.624	4398	165.8	0.255	6.56	0.167
	2	4121	179.4		6.74		4270	165.5		6.50
Age 30–39	1	3221	179.2	0.674	6.82	0.209	4120	165.2	0.594	6.58	0.069
	2	3351	178.9		6.64		3887	165.0		6.43
Age 40–49	1	2403	178.9	0.791	6.69	0.775	2877	164.6	0.836	6.36	0.961
	2	2411	178.9		6.70		2775	164.9		6.33
Age 50–59	1	2678	178.0	0.532	6.73	0.281	3261	164.1	0.898	6.20	0.081
	2	2634	177.7		6.56		3086	164.3		6.05
Age 60–69	1	1265	175.9	0.927	6.73	0.657	1560	162.9	0.813	6.13	0.280
	2	1276	175.8		6.85		1532	162.9		6.27
Age 70–79	1	310	175.3	0.586	6.53	0.287	435	162.1	0.543	6.78	0.064
	2	329	175.0		6.82		390	161.4		6.05

p value^a: p value for equality of means, p value^b: p value for equality of variances, SD: standard deviation.