Table 3.

Worsening of Scores in Each Specific Item and Domain in the Tokyo Metropolitan Institute of Gerontology Index of Competence Instrumental Activities of Daily Living Among Patients Who Responded to Both the Preoperative and Postoperative Surveys (N = 841)

Item	Number of Patients Reporting Score Worsening	% (95% CI)
1.Can you use public transportation (bus or train) by yourself?	73	8.7 (6.9–10.8)
2.Are you able to shop for daily necessities?	42	5.0 (3.6–6.7)
3.Are you able to prepare meals by yourself?	66	7.9 (6.1–9.9)
4.Are you able to pay bills?	37	4.4 (3.1–6.0)
5.Can you handle your own banking?	43	5.1 (3.7–6.8)
Domain: Instrumental self-maintenance (items 1–5) by one point or more	136	16.2 (13.8–18.8)
Domain: Instrumental self-maintenance (items 1–5) by two points or more	60	7.1 (5.5–9.1)
6.Are you able to fill out forms for your pension?	58	6.9 (5.3–8.8)
7.Do you read newspapers?	44	5.2 (3.8–7.0)
8.Do you read books or magazines?	66	7.9 (6.1–9.9)
9.Are you interested in news stories or programs dealing with health?	31	3.7 (2.5–5.2)
Domain: Effectance (items 6–9) by one point or more	143	17.0 (14.5–19.7)
Domain: Effectance (items 6–9) by two points or more	37	4.4 (3.1–6.0)
10.Do you visit the homes of friends?	135	16.1 (13.6–18.7)
11.Are you sometimes called on for advice?	113	13.4 (11.2–15.9)
12.Are you able to visit sick friends?	142	16.9 (14.4–19.6)
13.Do you sometimes initiate conversations with young people?	87	10.3 (8.4–12.6)
Domain: Social role (items 10–13) by one point or more	306	36.4 (33.1–39.7)
Domain: Social role (items 10–13) by two points or more	120	14.3 (12.0–16.8)

CI, confidence interval.