Data
164,557 items of data are available, covering 154,894 participants.
Defined-instances run from 0 to 1, labelled using Instancing
1.
Units of measurement are mmol/mol.
| Maximum | 191 |
| Decile 9 | 66 |
| Decile 8 | 44 |
| Decile 7 | 41 |
| Decile 6 | 39 |
| Median | 37 |
| Decile 4 | 36 |
| Decile 3 | 35 |
| Decile 2 | 33 |
| Decile 1 | 32 |
| Minimum | 9 |
|
|
- Mean = 43.364
- Std.dev = 18.7127
- 5364 items above graph maximum of 100
|
2 Instances
Instance 0 : Baseline (1998-2004)
154,697 participants, 154,697 items
| Maximum | 191 |
| Decile 9 | 66 |
| Decile 8 | 44 |
| Decile 7 | 40 |
| Decile 6 | 39 |
| Median | 37 |
| Decile 4 | 36 |
| Decile 3 | 35 |
| Decile 2 | 33 |
| Decile 1 | 32 |
| Minimum | 9 |
|
|
- Mean = 43.1964
- Std.dev = 18.7142
- 5067 items above graph maximum of 100
|
Instance 1 : Resurvey (2015-2019)
9,860 participants, 9,860 items
| Maximum | 157 |
| Decile 9 | 72 |
| Decile 8 | 52 |
| Decile 7 | 44 |
| Decile 6 | 41 |
| Median | 39 |
| Decile 4 | 38 |
| Decile 3 | 36 |
| Decile 2 | 35 |
| Decile 1 | 33 |
| Minimum | 12 |
|
|
- Mean = 45.9935
- Std.dev = 18.491
- 131 items above graph maximum of 111
|
Notes
Glycosylated haemoglobin (HbA1c) was measured from the buffy coat samples. Assays were performed in the International Organisation for Standardisation (ISO) 17025-accredited Wolfson Laboratories (
https://www.ctsu.ox.ac.uk/research/laboratories) of the Clinical Trial Service Unit and Epidemiological Studies Unit, using validated high-performance liquid chromatography methods
1 on HA-8180 analysers (Arkray, Inc.) with calibrators traceable to International Federation of Clinical Chemistry (IFCC) standards
2.
Measurements were expressed in IFCC units of millimoles per mole; which has then been converted3 to Diabetes Control and Complications Trial (DCCT) glycated haemoglobin percentages by multiplying the number of millimoles per mole by 0.09148 and adding 2.152.
- Youngman LD, Clark S, Manley S, Peto R, Collins R. Reliable measurement of glycated hemoglobin in frozen blood samples: implications for epidemiologic studies. Clin Chem. 2002;48(9):1627-1629.
- International Federation of Clinical Chemistry. Standardization of HbA1c. NGSP. http://www.ngsp.org/docs/IFCCstd.pdf
- Rao Kondapally Seshasai S, Kaptoge S, Thompson A, Di Angelantonio E, Gao P, Sarwar N, Whincup PH, Mukamal KJ, Gillum RF, Holme I, Njolstad I, Fletcher A, Nilsson P, Lewington S, Collins R, Gudnason V, Thompson SG, Sattar N, Selvin E, Hu FB, Danesh J; Emerging Risk Factors Collaboration. Diabetes mellitus, fasting glucose, and risk of cause-specific death. N Engl J Med 2011; 364: 829-41.
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