Table 1.2.a. Red blood cell (RBC) folate: Total population
Geometric mean and selected percentiles of RBC concentrations (in ng/mL) for the total U.S. population aged3 years and older, National Health and Nutrition Examination Survey, 1999–2002.
Table 1.2.b. Red blood cell (RBC) folate: Mexican Americans
Geometric mean and selected percentiles of RBC concentrations (in ng/mL) for Mexican Americans in the U.S.population aged 3 years and older, National Health and Nutrition Examination Survey, 1999–2002.
Geometric mean (95% conf. interval)
Selected percentiles (95% conf. interval)
Sample size
5th
50th
95th
Males and Females
Total, 3 years and older
258
(251-265)
155
(146-161)
254
(248-261)
456
(435-473)
4726
3–5 years
289
(280-298)
201
(194-210)
278
(270-289)
458
(403-524)
273
6–11 years
282
(276-288)
197
(180-211)
276
(270-282)
444
(402-492)
658
12–19 years
245
(239-252)
156
(145-164)
241
(237-248)
408
(381-428)
1642
20–39 years
239
(231-248)
140
(126-149)
235
(229-243)
423
(392-443)
870
40–59 years
273
(263-283)
167
(160-172)
267
(255-275)
496
(454-552)
634
60 years and older
301
(285-317)
161
(141-180)
291
(275-314)
590
(534-711)
649
Males
Total, 3 years and older
250
(242-258)
145
(133-155)
251
(241-257)
430
(401-457)
2306
3–5 years
297
(284-311)
210†
(196-220)
283
(270-299)
514†
(401-599)
144
6–11 years
287
(280-295)
201
(185-214)
283
(274-292)
443
(383-511)
339
12–19 years
241
(234-248)
155
(141-166)
238
(233-246)
376
(356-406)
813
20–39 years
227
(215-239)
129
(114-147)
225
(211-237)
392
(351-435)
385
40–59 years
263
(252-275)
165
(152-171)
265
(251-278)
432
(392-498)
302
60 years and older
293
(269-318)
152
(133-190)
285
(266-299)
567
(525-702)
323
Females
Total, 3 years and older
268
(260-275)
159
(155-168)
260
(251-266)
488
(457-517)
2420
3–5 years
279
(267-292)
188†
(182-203)
272
(259-289)
418†
(371-458)
129
6–11 years
276
(268-285)
194
(173-212)
268
(263-275)
434
(384-492)
319
12–19 years
250
(242-258)
157
(145-167)
243
(237-250)
434
(393-486)
829
20–39 years
255
(246-265)
152
(141-159)
250
(233-260)
436
(421-512)
485
40–59 years
284
(269-299)
171
(163-181)
269
(248-291)
538
(464-624)
332
60 years and older
308
(295-321)
168
(154-184)
305
(280-318)
600
(532-785)
326
† Estimate is subject to greater uncertainty due to small cell size.
Table 1.2.c. Red blood cell (RBC) folate: Non-Hispanic blacks
Geometric mean and selected percentiles of RBC concentrations (in ng/mL) for non-Hispanic blacks in the U.S.population aged 3 years and older, National Health and Nutrition Examination Survey, 1999–2002.
Geometric mean (95% conf. interval)
Selected percentiles (95% conf. interval)
Sample size
5th
50th
95th
Males and Females
Total, 3 years and older
221
(216-226)
123
(120-129)
220
(214-224)
383
(370-399)
3783
3–5 years
247
(240-254)
166
(159-180)
244
(235-251)
364
(326-411)
248
6–11 years
238
(232-243)
161
(151-172)
240
(233-247)
336
(322-350)
623
12–19 years
200
(196-205)
123
(117-129)
203
(197-209)
310
(295-320)
1265
20–39 years
209
(202-216)
117
(113-124)
209
(201-215)
361
(340-385)
598
40–59 years
222
(215-230)
120
(111-130)
222
(213-231)
396
(367-427)
553
60 years and older
254
(243-267)
125
(110-136)
255
(240-267)
535
(476-590)
496
Males
Total, 3 years and older
216
(210-222)
122
(116-132)
219
(212-226)
360
(341-372)
1856
3–5 years
246
(235-257)
168†
(145-188)
244
(234-254)
364†
(314-508)
130
6–11 years
243
(237-250)
161
(153-178)
248
(238-255)
334
(313-361)
316
12–19 years
203
(198-209)
124
(116-131)
208
(202-214)
310
(292-327)
645
20–39 years
203
(194-211)
118
(101-135)
207
(197-214)
322
(302-350)
249
40–59 years
211
(202-221)
121
(104-132)
211
(194-226)
364
(348-396)
277
60 years and older
244
(229-260)
117
(103-134)
248
(227-266)
460
(403-592)
239
Females
Total, 3 years and older
225
(219-231)
124
(117-130)
221
(216-226)
411
(378-453)
1927
3–5 years
248
(238-258)
165†
(159-181)
244
(233-258)
379†
(319-453)
118
6–11 years
232
(224-240)
158
(132-177)
230
(221-242)
336
(319-369)
307
12–19 years
197
(192-202)
124
(111-131)
197
(189-201)
303
(291-320)
620
20–39 years
214
(205-223)
119
(113-127)
210
(200-220)
379
(352-445)
349
40–59 years
233
(222-244)
122
(109-141)
233
(220-247)
409
(370-512)
276
60 years and older
262
(246-279)
127
(104-151)
262
(241-277)
553
(496-599)
257
† Estimate is subject to greater uncertainty due to small cell size.
Table 1.2.d. Red blood cell (RBC) folate: Non-Hispanic whites
Geometric mean and selected percentiles of RBC concentrations (in ng/mL) for non-Hispanic whites in the U.S.population aged 3 years and older, National Health and Nutrition Examination Survey, 1999–2002.
Geometric mean (95% conf. interval)
Selected percentiles (95% conf. interval)
Sample size
5th
50th
95th
Males and Females
Total, 3 years and older
297
(289-304)
166
(160-172)
292
(284-299)
551
(536-570)
6210
3–5 years
303
(289-318)
204
(180-231)
300
(290-309)
474
(390-546)
231
6–11 years
292
(283-301)
189
(183-207)
290
(282-296)
464
(422-519)
498
12–19 years
257
(249-265)
160
(152-164)
253
(246-261)
436
(400-458)
1083
20–39 years
268
(257-279)
150
(135-165)
265
(252-278)
475
(449-524)
1383
40–59 years
305
(296-313)
173
(166-180)
302
(293-309)
545
(506-597)
1291
60 years and older
352
(342-361)
182
(170-193)
355
(344-365)
674
(639-702)
1724
Males
Total, 3 years and older
287
(279-296)
165
(158-173)
281
(272-291)
523
(501-544)
3037
3–5 years
308
(286-332)
204†
(165-231)
310
(290-324)
512†
(403-634)
120
6–11 years
300
(289-311)
211
(189-225)
290
(276-299)
473
(422-533)
263
12–19 years
251
(241-261)
158
(145-164)
246
(238-256)
410
(372-454)
538
20–39 years
258
(247-269)
157
(147-165)
256
(241-270)
432
(402-463)
578
40–59 years
295
(286-304)
171
(157-180)
292
(280-303)
527
(491-601)
672
60 years and older
339
(325-355)
170
(158-190)
342
(322-359)
660
(601-717)
866
Females
Total, 3 years and older
306
(297-315)
167
(159-174)
302
(293-310)
580
(551-604)
3173
3–5 years
298
(285-311)
201†
(189-236)
294
(279-307)
436†
(382-546)
111
6–11 years
283
(273-294)
182
(173-192)
290
(277-298)
453
(381-508)
235
12–19 years
264
(253-275)
160
(149-167)
262
(250-270)
451
(395-539)
545
20–39 years
278
(265-293)
143
(130-167)
278
(261-293)
548
(490-591)
805
40–59 years
315
(300-330)
176
(165-190)
308
(295-327)
570
(503-611)
619
60 years and older
361
(354-369)
191
(182-201)
364
(351-372)
680
(639-711)
858
† Estimate is subject to greater uncertainty due to small cell size.
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