Dietary Reference Intakes for Calcium and Vitamin D (2011)
Chapter: Appendix E: Literature Search Strategy
E
Literature Search Strategy
In order to review the most relevant scientific literature available, the committee and staff regularly conducted thorough searches of several online bibliographic data bases, including Medline, Science Direct, and WorldCat/First Search. General searches on vitamin D, calcium, and health outcomes were first conducted to identify primary literature. Using the results of the primary search, key search terms were developed and secondary searches were then conducted. Search terms were also chosen based on relevance to the report outline and topics included in the previous IOM report (IOM, 1997). Although initial searches were general, subsequent searches focused on retrieving studies that were not covered by the evidence-based reviews conducted by AHRQ-Ottawa (Cranney et al., 2007) and AHRQ-Tufts (Chung et al., 2009). Similar to the methodology used by the AHRQ reports searches were limited to English. As the study progressed, focused searches were conducted as needed and general searches were carried out to identify newly published articles. See Box E-1 for an example of how searches were conducted.
TABLE E-1 Sample Search History for Literature Published After AHRQ-Tufts
|
Number |
Searches |
Results |
|
1 |
exp Vitamin D/ |
34296 |
|
2 |
(25-hydroxy vit D or plasma vit D or 25OHD or 25-OHD) |
956 |
|
3 |
(25OHD3 or “25(OH)D3” or 25-OHD3 or “25-(OH)D3”).tw. |
1205 |
|
4 |
(“25(OH)D” or “25-(OH)D” or “25-OH-D”).tw. |
1696 |
|
5 |
25-hydroxycholecalciferol.tw. |
877 |
|
6 |
25-hydroxyergocalciferol.tw. |
27 |
|
7 |
calcidiol.tw. |
227 |
|
8 |
Calcifediol/ |
2443 |
|
9 |
(vit adj (d or d2 or d3)).mp. |
244 |
|
10 |
Ergocalciferols/ |
2050 |
|
11 |
Ergocalciferol$.tw. |
322 |
|
12 |
Cholecalciferol/ |
4499 |
|
13 |
Cholecalciferol$.tw. |
1172 |
|
14 |
calciferol.tw. |
363 |
|
15 |
or/1-14 |
35253 |
|
16 |
exp Calcium/ |
218026 |
|
17 |
exp Calcium Carbonate/ or exp Calcium Citrate/ or exp Calcium Phosphates/ or exp Calcium Malate/ |
24264 |
|
18 |
exp Calcium, Dietary/ Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (7533) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (515) Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (7533) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (515) |
8048 |
|
19 |
calcium.tw. |
250569 |
|
20 |
or/16-19 |
373131 |
|
21 |
15 or 20 |
392115 |
|
22 |
21 and (200905* or 200906* or 200907* or 200908*).ed. |
3840 |
|
23 |
limit 22 to english language [Limit not valid in CCTR; records were retained] |
3544 |
|
24 |
limit 23 to humans [Limit not valid in CCTR; records were retained] |
1906 |
|
Number |
Searches |
Results |
|
25 |
limit 24 to (addresses or bibliography or biography or comment or congresses or consensus development conference or consensus development conference, nih or dictionary or directory or duplicate publication or editorial or in vitro or interview or lectures or letter or news or newspaper article or “review”) [Limit not valid in CCTR; records were retained] |
443 |
|
26 |
24 not 25 |
1463 |
|
27 |
randomized controlled trial.pt. |
537352 |
|
28 |
controlled clinical trial.pt. |
156124 |
|
29 |
randomized controlled trials/ |
62621 |
|
30 |
Random Allocation/ |
85834 |
|
31 |
Double-blind Method/ |
187602 |
|
32 |
Single-Blind Method/ |
21457 |
|
33 |
clinical trial.pt. |
729105 |
|
34 |
Clinical Trials.mp. or exp Clinical Trials/ |
268451 |
|
35 |
exp Clinical Trial/ |
587643 |
|
36 |
(clinic$ adj25 trial$).tw. |
218792 |
|
37 |
((singl$ or doubl$ or trebl$ or tripl$) adj (mask$ or blind$)).tw. |
214271 |
|
38 |
Placebos/ |
46595 |
|
39 |
placebo$.tw. |
225224 |
|
40 |
random$.tw. |
736338 |
|
41 |
trial$.tw. |
569938 |
|
42 |
(latin adj square).tw. |
3500 |
|
43 |
Comparative Study.tw. |
55680 |
|
44 |
exp Evaluation studies/ |
140739 |
|
45 |
Follow-Up Studies/ |
421249 |
|
46 |
Prospective Studies/ |
316292 |
|
47 |
(control$ or prospectiv$ or volunteer$).tw. |
2441089 |
|
48 |
Cross-Over Studies/ Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (24638) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (18713) Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (24638) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (18713) |
43351 |
|
Number |
Searches |
Results |
|
49 |
or/27-48 |
3820192 |
|
50 |
49 and 26 |
551 |
|
51 |
21 |
392115 |
|
52 |
limit 51 to english language [Limit not valid in CCTR; records were retained] |
351480 |
|
53 |
limit 52 to yr=“2009—2010” Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (8085) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (89) Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (8085) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (89) |
8174 |
|
54 |
limit 53 to humans [Limit not valid in CCTR; records were retained] Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (2956) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (89) Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (2956) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (89) |
3045 |
|
55 |
remove duplicates from 54 Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (2751) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (3) Ovid MEDLINE(R) In-Process & Other Non-Indexed Citations and Ovid MEDLINE(R) <1950 to Present> (2751) EBM Reviews—Cochrane Central Register of Controlled Trials <3rd Quarter 2009> (3) |
2754 |
REFERENCES
Chung M., E. M. Balk, M. Brendel, S. Ip, J. Lau, J. Lee, A. Lichtenstein, K. Patel, G. Raman, A. Tatsioni, T. Terasawa and T. A. Trikalinos. 2009. Vitamin D and Calcium: A Systematic Review of Health Outcomes. Evidence Report No. 183. (Prepared by the Tufts Evidence-based Practice Center under Contract No. HHSA 290-2007-10055-I.) AHRQ Publication No. 09-E015. Rockville, MD: Agency for Healthcare Research and Quality.
Cranney A., T. Horsley, S. O’Donnell, H. A. Weiler, L. Puil, D. S. Ooi, S. A. Atkinson, L. M. Ward, D. Moher, D. A. Hanley, M. Fang, F. Yazdi, C. Garritty, M. Sampson, N. Barrowman, A. Tsertsvadze and V. Mamaladze. 2007. Effectiveness and Safety of Vitamin D in Relation to Bone Health. Evidence Report/Technology Assessment No. 158. (Prepared by the University of Ottawa Evidence-based Practice Center (UO-EPC) under Contract No. 290-02-0021.) AHRQ Publication No. 07-E013. Rockville, MD: Agency for Healthcare Research and Quality.
IOM (Institute of Medicine). 1997. Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride. Washington, DC: National Academy Press.
