Table 1. Number of observations in the reference database by age, gender, and ethnicity.

Age Group	Gender	Whites	Blacks	Mexican Americans
8 to 9	Male	81	90	93
	Female	49	75	51
10 to 11	Male	140	196	169
	Female	97	123	110
12 to 13	Male	186	229	250
	Female	144	167	141
14 to 15	Male	222	292	296
	Female	173	213	213
16 to 17	Male	238	296	308
	Female	154	172	171
18 to 20	Male	338	422	452
	Female	319	333	395
20 to 25	Male	235	138	160
	Female	323	160	239
25 to 30	Male	238	100	164
	Female	338	127	180
30 to 35	Male	241	118	138
	Female	350	145	149
35 to 40	Male	249	114	116
	Female	298	139	135
40 to 45	Male	292	149	164
	Female	260	154	174
45 to 50	Male	244	125	135
	Female	244	148	129
50 to 55	Male	298	101	72
	Female	287	94	100
55 to 60	Male	207	72	63
	Female	204	78	53
60 to 65	Male	248	115	166
	Female	263	138	168
65 to 70	Male	243	112	123
	Female	238	93	144
70 to 75	Male	288	70	105
	Female	236	72	105
75 to 80	Male	225	54	64
	Female	206	65	54
80 to 85	Male	257	23	33
	Female	299	28	32
85+	Male	168	18	17
	Female	184	25	25
Total	Male	4638	2834	3088
	Female	4666	2559	2768