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. 2019 Aug 7;366:l4466. doi: 10.1136/bmj.l4466

Table 1.

Classification of major surgical operations in study and those occurring before the last cognitive assessment in each participant. Values are numbers (percentages)

Major surgery Whole study* (n=4525 admissions) Cognitive follow-up (n=2932 admissions)
Cardiac:
 Overall 219 (4.8) 153 (5.2)
 Valve 61 (1.3) 37 (1.3)
 Other 158 (3.5) 116 (4.0)
Thoracic: overall 182 (4.0) 85 (2.9)
Vascular:
 Overall 139 (3.1) 84 (2.9)
 Intervention 48 (1.1) 28 (1.0)
 Other 91 (2.0) 56 (1.9)
Intracranial neurosurgery: overall 89 (2.0) 38 (1.3)
Major non-intracranial/non-cardiothoracic/non-vascular:
 Overall 3896 (86.1) 2572 (87.7)
 General 1267 (28.0) 766 (26.1)
 Orthopedic 1325 (29.3) 971 (33.1)
 Other 1304 (28.8) 835 (28.5)
*

Includes all surgical operations that occurred between baseline (1997-99) and March 2017, including those after the latest available cognitive assessment.