Table 1.
Characteristics of hemoglobin A1c resultsa among people with type 1 and type 2 diabetes.
| Variable | Type 1 diabetes (1949 HbA1cb results from 296 people) | Type 2 diabetes (945,262 HbA1c results from 90,417 people) | |||||||
|
|
Male (n=155) | Female (n=141) | Male (n=47,286) | Female (n=43,131) | |||||
| Population | |||||||||
|
|
People with HbA1c results in 2 age groups, n (%) | 22 (14.2) | 30 (21.3) | 11,630 (24.6) | 10,350 (24) | ||||
| HbA1c resultsa | |||||||||
|
|
Mean (SD), % | 8 (1.7) | 8.3 (1.7) | 7.2 (1.3) | 7.1 (1.3) | ||||
|
|
Mean (SD), mmol/mol | 64 (16) | 67 (16) | 55 (12) | 54 (12) | ||||
|
|
Median (Q1-Q3c; ranged), % | 7.6 (6.9-8.5; 4.8-16.3) | 8 (7.2-9.1; 5-16) | 6.9 (6.3-7.8; 3.5-19.6) | 6.8 (6.3-7.6; 3.5-19.5) | ||||
|
|
Median (Q1-Q3c; ranged), mmol/mol | 60 (52-69; 29-155) | 64 (55-76; 31-151) | 52 (45-62; 15-191) | 51 (45-60; 15-190) | ||||
|
|
Results per person, median (Q1-Q3c; ranged) | 4 (2-9; 1-42) | 5 (2-9; 1-48) | 8 (4-15; 1-112) | 8 (4-15; 1-115) | ||||
|
|
HbA1c results ≤7%, % | 30.5 | 21 | 55 | 59 | ||||
|
|
Total, n (%) | 970 (49.7) | 979 (50.2) | 505,364 (53.4) | 439,898 (46.5) | ||||
| Age (years), n (%)a | |||||||||
|
|
10-19 | 44 (4.5) | 37 (3.7) | 1020 (0.2) | 1097 (0.2) | ||||
|
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20-39 | 454 (46.8) | 559 (57) | 13,744 (2.7) | 18,675 (4.2) | ||||
|
|
40-59 | 305 (31.4) | 277 (28.2) | 145,393 (28.7) | 123,621 (28.1) | ||||
|
|
60-79 | 167 (17.2) | 106 (10.8) | 287,045 (56.7) | 235,044 (53.4) | ||||
|
|
≥80 | 0 (0) | 0 (0) | 58,162 (11.5) | 61,461 (13.9) | ||||
| Socioeconomic status, n (%)a | |||||||||
|
|
1 (lowest income) | 199 (20.5) | 336 (34.3) | 115,565 (22.8) | 116,715 (26.5) | ||||
|
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2 | 141 (14.5) | 151 (15.4) | 108,374 (21.4) | 98,284 (22.3) | ||||
|
|
3 | 223 (22.9) | 196 (20) | 94,672 (18.7) | 80,026 (18.1) | ||||
|
|
4 | 222 (22.8) | 182 (18.5) | 93,043 (18.4) | 74,537 (16.9) | ||||
|
|
5 (highest income) | 185 (19) | 114 (11.6) | 93,710 (18.5) | 70,336 (15.9) | ||||
aAs noted in the Methods section, our unit of analysis is each HbA1c result. These summary statistics are therefore calculated across HbA1c results in the data set, meaning that each HbA1c result within a given category contributes 1 data point.
bHbA1c: hemoglobin A1c.
cQ1-Q3: quartile 1-quartile 3.
dRange=minimum value-maximum value.