Table 2.

Descriptive statistics of corrected raw GCP scores over time (N=560)^*

Month visit		N	Mean (SD)	Mean change from baseline
Overall
	0	560	57.6 (7.3)	–
	1	548	56.8 (7.9)	−0.94 (3.3)
	2	536	58.0 (7.9)	0.26 (3.4)
	6	528	58.2 (7.5)	0.37 (3.4)
	12	511	58.4 (7.6)	0.53 (3.3)
	18	499	58.3 (8.0)	0.40 (3.4)
	24	474	58.2 (8.0)	0.11 (3.7)
	30	325	57.5 (8.2)	−0.16 (4.2)
	36	312	57.1 (8.4)	−0.47 (4.5)
Delirium
	0	134	54.7 (6.5)	–
	1	129	52.9 (7.0)	−1.95 (3.5)
	2	126	54.8 (7.4)	−0.05 (4.4)
	6	124	55.3 (7.2)	0.29 (4.0)
	12	120	55.1 (6.4)	−0.00 (3.9)
	18	117	54.7 (7.6)	−0.13 (3.9)
	24	106	55.4 (7.3)	−0.54 (4.1)
	30	83	54.5 (7.8)	−1.07 (4.1)
	36	86	53.7 (7.7)	−1.90 (4.9)
No delirium
	0	426	58.5 (7.3)	–
	1	419	58.0 (7.7)	−0.64 (3.2)
	2	410	59.0 (7.8)	0.35 (3.1)
	6	404	59.1 (7.4)	0.39 (3.2)
	12	391	59.4 (7.6)	0.69 (3.1)
	18	382	59.4 (7.8)	0.56 (3.3)
	24	368	59.2 (7.7)	0.29 (3.6)
	30	242	58.4 (8.0)	0.15 (4.1)
	36	226	58.4 (8.0)	0.08 (4.2)

GCP = General Cognitive Performance

^*Note: All postoperative GCP values corrected for learning effects (see text for details). The number of participants completing each the interview/the number of participants eligible for the interview for each time point follows with amount of attrition from the prior time point in parentheses. Baseline: 560/560 (0); Month 1: 548/552 (8); Month 2: 536/546 (5); Month 6: 528/539 (7); Month 12: 511/527 (8); Month 18: 499/516 (8); Month 24: 474/489 (13); Month 30: 325/342 (6); Month 36: 312/316 (1).