Table 3.3.a. Serum total iron-binding capacity: Total population

Geometric mean and selected percentiles of serum concentrations (in μg/dL) for the total U.S. population, aged 1 year and older, National Health and Nutrition Examination Survey, 1999–2000.

Geometric mean
(95% conf. interval)

Selected percentiles (95% conf. interval)

Sample
size

10th

50th

90th

Males and Females

Total, 1 year and older

366

(360-371)

297

(292-304)

367

(359-374)

447

(441-453)

7847

1–5 years

371

(359-383)

309

(286-322)

374

(361-384)

446

(434-454)

699

6–11 years

369

(361-378)

312

(295-320)

372

(361-380)

438

(423-444)

883

12–19 years

383

(374-391)

312

(301-328)

385

(377-392)

461

(451-471)

2124

20–39 years

365

(359-371)

299

(289-306)

363

(357-371)

450

(446-459)

1468

40–59 years

364

(359-370)

298

(291-305)

364

(354-373)

441

(433-453)

1195

60 years and older

353

(347-358)

284

(276-290)

355

(347-361)

437

(424-450)

1478

Males

Total, 1 year and older

356

(349-364)

294

(287-300)

358

(351-365)

431

(421-438)

3860

1–5 years

375

(363-387)

306

(276-327)

379

(363-390)

449

(429-477)

385

6–11 years

364

(351-377)

304

(281-323)

366

(357-381)

426

(408-442)

460

12–19 years

374

(366-383)

313

(297-329)

379

(367-386)

448

(436-461)

1076

20–39 years

349

(341-357)

293

(282-298)

350

(342-358)

416

(402-432)

631

40–59 years

357

(350-364)

294

(289-302)

357

(351-365)

425

(409-436)

567

60 years and older

345

(337-353)

283

(269-288)

348

(338-357)

431

(409-446)

741

Females

Total, 1 year and older

375

(370-381)

305

(298-309)

377

(369-383)

460

(454-465)

3987

1–5 years

366

(352-381)

307

(271-321)

369

(351-386)

439

(424-447)

314

6–11 years

375

(367-383)

312

(305-320)

374

(370-387)

441

(427-453)

423

12–19 years

391

(382-402)

312

(302-335)

393

(383-401)

475

(456-491)

1048

20–39 years

382

(375-390)

308

(303-316)

383

(374-397)

477

(463-485)

837

40–59 years

371

(365-378)

300

(290-310)

373

(360-384)

450

(442-466)

628

60 years and older

359

(354-364)

289

(282-296)

361

(354-371)

439

(424-457)

737

Table 3.3.b. Serum total iron-binding capacity: Mexican Americans

Geometric mean and selected percentiles of serum concentrations (in μg/dL) for Mexican Americans in the U.S. population, aged 1 year and older, National Health and Nutrition Examination Survey, 1999–2000.

Geometric mean
(95% conf. interval)

Selected percentiles (95% conf. interval)

Sample
size

10th

50th

90th

Males and Females

Total, 1 year and older

373

(363-384)

303

(288-314)

375

(366-385)

455

(438-478)

2707

1–5 years

378

(370-387)

316

(303-323)

377

(368-390)

453

(444-476)

274

6–11 years

379

(371-388)

320

(308-327)

385

(372-395)

441

(433-451)

361

12–19 years

396

(380-413)

328

(316-336)

395

(386-408)

486

(447-551)

938

20–39 years

370

(357-384)

299

(277-319)

375

(354-387)

457

(426-485)

407

40–59 years

365

(359-370)

291

(275-308)

367

(358-372)

439

(431-476)

344

60 years and older

345

(334-357)

277

(263-290)

350

(338-363)

415

(405-434)

383

Males

Total, 1 year and older

365

(356-375)

301

(282-314)

370

(357-380)

437

(427-449)

1345

1–5 years

382

(370-394)

318

(299-329)

387

(368-396)

456

(436-492)

150

6–11 years

382

(371-393)

324

(313-337)

386

(366-403)

441

(425-452)

198

12–19 years

383

(374-392)

319

(304-330)

388

(381-395)

460

(448-469)

480

20–39 years

359

(344-374)

300

(275-319)

361

(348-380)

428

(411-442)

170

40–59 years

353

(345-361)

281

(270-305)

357

(347-367)

417

(403-437)

152

60 years and older

339

(327-352)

276

(250-288)

345

(324-362)

409

(383-434)

195

Females

Total, 1 year and older

382

(370-395)

308

(293-318)

384

(373-393)

476

(449-504)

1362

1–5 years

374

(360-389)

316

(301-334)

368

(355-392)

449

(422-473)

124

6–11 years

376

(368-384)

315

(305-325)

383

(370-391)

449

(430-456)

163

12–19 years

409

(383-437)

337

(325-345)

405

(384-428)

529

(436-579)

458

20–39 years

384

(366-402)

301

(275-325)

383

(371-404)

485

(452-526)

237

40–59 years

376

(365-388)

299

(284-311)

374

(361-390)

475

(438-496)

192

60 years and older

351

(337-366)

276

(245-304)

354

(343-365)

421

(408-451)

188

Table 3.3.c. Serum total iron-binding capacity: Non-Hispanic blacks

Geometric mean and selected percentiles of serum concentrations (in μg/dL) for non-Hispanic blacks in the U.S. population, aged 1 year and older, National Health and Nutrition Examination Survey, 1999–2000.

Geometric mean
(95% conf. interval)

Selected percentiles (95% conf. interval)

Sample
size

10th

50th

90th

Males and Females

Total, 1 year and older

354

(349-359)

287

(282-293)

354

(346-360)

435

(427-443)

1774

1–5 years

370

(363-377)

315

(306-334)

365

(360-375)

435

(415-455)

172

6–11 years

366

(362-371)

316

(303-327)

367

(360-375)

427

(418-434)

257

12–19 years

374

(368-379)

312

(301-321)

375

(370-380)

447

(432-460)

582

20–39 years

356

(346-366)

288

(273-301)

346

(341-360)

444

(428-475)

273

40–59 years

342

(332-353)

276

(262-286)

346

(331-359)

426

(409-443)

249

60 years and older

323

(315-331)

259

(242-271)

322

(315-330)

401

(380-435)

241

Males

Total, 1 year and older

342

(337-348)

283

(266-291)

344

(340-349)

414

(407-421)

868

1–5 years

368

(358-378)

320†

(295-340)

367

(359-381)

416†

(401-435)

93

6–11 years

365

(358-372)

318

(306-328)

364

(355-374)

423

(409-431)

126

12–19 years

365

(360-371)

307

(293-317)

369

(360-376)

432

(416-450)

299

20–39 years

331

(320-342)

265

(253-288)

331

(314-344)

401

(367-428)

117

40–59 years

333

(319-347)

266

(222-296)

333

(313-362)

405

(384-423)

120

60 years and older

324

(317-331)

259

(232-282)

325

(313-338)

397

(375-421)

113

Females

Total, 1 year and older

364

(359-370)

290

(283-298)

364

(354-375)

447

(441-457)

906

1–5 years

372

(360-384)

315†

(286-334)

362

(351-382)

475†

(415-481)

79

6–11 years

368

(359-376)

311

(295-329)

371

(353-384)

432

(417-443)

131

12–19 years

382

(374-391)

321

(304-328)

382

(372-390)

456

(433-487)

283

20–39 years

379

(370-387)

309

(293-319)

379

(362-398)

478

(436-496)

156

40–59 years

351

(337-365)

275

(262-296)

352

(338-368)

442

(414-448)

129

60 years and older

323

(310-336)

254

(235-276)

321

(306-333)

406

(375-450)

128

† Estimate is subject to greater uncertainty due to small cell size.

Table 3.3.d. Serum total iron-binding capacity: Non-Hispanic whites

Geometric mean and selected percentiles of serum concentrations (in μg/dL) for non-Hispanic whites in the U.S. population, aged 1 year and older, National Health and Nutrition Examination Survey, 1999–2000.

Geometric mean
(95% conf. interval)

Selected percentiles (95% conf. interval)

Sample
size

10th

50th

90th

Males and Females

Total, 1 year and older

367

(361-373)

300

(294-307)

367

(359-375)

448

(441-454)

2630

1–5 years

368

(349-387)

305

(265-331)

377

(351-394)

442

(424-451)

168

6–11 years

372

(363-382)

313

(304-321)

372

(359-388)

442

(413-467)

191

12–19 years

379

(368-391)

311

(293-328)

384

(374-395)

461

(448-474)

418

20–39 years

367

(362-371)

299

(291-307)

365

(359-374)

450

(442-463)

608

40–59 years

369

(362-376)

302

(294-314)

367

(354-379)

444

(433-458)

494

60 years and older

357

(351-362)

288

(284-293)

358

(349-368)

438

(427-454)

751

Males

Total, 1 year and older

358

(350-366)

295

(286-302)

357

(350-366)

433

(419-442)

1306

1–5 years

370

(355-386)

301†

(253-331)

379

(348-398)

446†

(411-473)

90

6–11 years

364

(345-384)

304†

(269-326)

367

(352-388)

426†

(397-475)

101

12–19 years

372

(362-384)

310

(285-332)

377

(361-385)

447

(436-464)

213

20–39 years

351

(342-360)

296

(282-304)

352

(345-362)

418

(401-442)

264

40–59 years

364

(355-372)

301

(290-319)

362

(352-370)

426

(419-442)

253

60 years and older

347

(339-356)

284

(271-289)

348

(338-358)

434

(414-447)

385

Females

Total, 1 year and older

376

(370-382)

306

(300-311)

378

(370-386)

461

(453-471)

1324

1–5 years

365

(338-395)

304†

(201-336)

372

(334-401)

436†

(398-457)

78

6–11 years

382

(374-391)

317†

(313-338)

374

(370-393)

444†

(427-467)

90

12–19 years

387

(375-400)

311

(295-335)

391

(378-403)

471

(450-479)

205

20–39 years

383

(375-391)

307

(303-316)

383

(367-401)

478

(454-495)

344

40–59 years

374

(365-384)

302

(289-317)

376

(355-389)

454

(440-479)

241

60 years and older

365

(360-370)

293

(287-307)

369

(359-376)

450

(424-471)

366

† Estimate is subject to greater uncertainty due to small cell size.