Table 1: Actual sample sizes used in analyses by urine iodine status, gender, race/ethnicity, age, and smoking status. Data from National Health and Nutrition Examination Survey 2007-2012.

For blood lead For urine lead
Males Females Males Females
Urine iodine status Demographic group N % N % N % N %
Iodine deficient Total 1181 100.0 1329 100.0 777 100.0 856 100.0
Age: 12-19 years 205 17.4 231 17.4 125 16.1 156 18.2
Age: 20-64 years 816 69.1 921 69.3 550 70.8 507 59.2
Age: >= 65 years 160 13.5 177 13.3 102 13.1 103 12.0
Non-Hispanic White 482 40.8 557 41.9 311 40.0 346 40.4
Non-Hispanic Black 295 25.0 336 25.3 202 26.0 211 24.6
Mexican American 191 16.2 188 14.1 120 15.4 113 13.2
Other Hispanics 106 9.0 139 10.5 64 82 99 11.6
Other Race/ethnicities 107 9.1 109 8.2 80 10.3 87 10.2
Nonsmoker 807 68.3 1041 78.3 544 70.0 690 80.6
Smoker 374 31.7 288 21.7 233 30.0 166 19.4
Iodine replete Total 3097 100.0 2353 100.0 1820 100.0 1403 100.0
Age: 12-19 years 615 19.9 450 19.1 371 20.4 270 19.2
Age: 20-64 years 1859 60.0 142 62.6 1092 60.0 880 62.7
Age: >= 65 years 623 20.1 431 18.3 357 19.6 253 18.0
Non-Hispanic White 1398 45.1 943 40.1 778 42.7 557 39.7
Non-Hispanic Black 615 19.9 515 21.9 385 21.2 319 22.7
Mexican American 552 17.8 448 19.0 318 17.5 245 17.5
Other Hispanics 324 10.5 292 12.4 160 8.8 163 11.6
Other Race/ethnicities 208 6.7 155 6.6 80 4.4 119 8.5
Nonsmoker 2208 71.3 1925 81.8 1351 74.2 1154 82.3
Smoker 829 26.8 428 18.2 469 25.8 249 17.7