Table 1

Baseline characteristics by CKD stage for all AMI events captured after the study start. n (column %) unless specified otherwise.

CKD status
(main exposure)
At risk of CKD or mild CKDModerate to severe CKDTotal
CKD stage
(secondary exposure)
At risk of CKD and 1–23a3b4–5
Unique individuals375112107323496042
Total number of AMI events, N417313538253976748
Age at AMI event, years, mean (SD)70 (13)79 (10)82 (9)79 (12)73 (13)
Age category at AMI event, years
18–50299 (7)20 (1)<510 (3)330 (5)
50–641163 (28)91 (7)44 (5)38 (10)1336 (20)
65–791655 (40)531 (39)251 (30)122 (31)2559 (38)
80+1056 (25)711 (53)529 (64)227 (57)2523 (37)
Female1430 (34)638 (47)416 (50)168 (42)2652 (39)
Ethnicity
White3807 (91)1263 (93)773 (94)361 (91)6204 (92)
Other323 (8)73 (5)44 (5)34 (9)474 (7)
Missing43 (1)17 (1)8 (1)<570 (1)
IMD quintile
1 (least deprived)732 (18)252 (19)152 (18)68 (17)1204 (18)
2843 (20)306 (23)176 (21)85 (21)1410 (21)
3934 (22)331 (24)193 (23)79 (20)1537 (23)
4951 (23)255 (19)185 (22)96 (24)1487 (22)
5 (most deprived)690 (17)206 (15)114 (14)69 (17)1079 (16)
Missing23 (1)<55 (1)0 (0)31 (0)
Dialysis in primary care
Peritoneal dialysis0 (0)0 (0)0 (0)15 (4)15 (0)
Haemodialysis0 (0)0 (0)0 (0)24 (6)24 (0)
Renal dialysis, unspecified0 (0)0 (0)0 (0)7 (2)7 (0)
Kidney transplant5 (0)0 (0)<517 (4)26 (0)
Comorbidities
Angina959 (23)399 (29)275 (33)155 (39)1788 (26)
Cerebrovascular disease390 (9)178 (13)139 (17)81 (20)788 (12)
COPD514 (12)209 (15)168 (20)58 (15)949 (14)
Diabetes mellitus1293 (31)465 (34)356 (43)233 (59)2347 (35)
Heart failure400 (10)234 (17)211 (26)123 (31)968 (14)
Hypertension2333 (56)884 (65)583 (71)322 (81)4122 (61)
Myocardial infarction1050 (25)430 (32)274 (33)163 (41)1917 (28)
Peripheral vascular disease229 (5)108 (8)74 (9)47 (12)458 (7)
Smoking status
Non-smoker1953 (47)566 (42)306 (37)151 (38)2976 (44)
Ever-smoker2018 (48)530 (39)318 (39)140 (35)3006 (45)
Missing202 (5)257 (19)201 (24)106 (27)766 (11)
  • AMI, acute myocardial infarction; CKD, chronic kidney disease; COPD, chronic obstructive pulmonary disease; IMD, Index of Multiple Deprivation.;