Comparison of Instrumental Activities of Daily Living assessment by face-to-face or telephone interviews: a randomized, crossover study

Table 2 Description of agreement between the 2 modes of administration of the IADL questionnaire for the total patient sample

	Total (n = 292)
	n −/− (a)	n −/+ (b)	n +/− (c)	n +/+ (d)	Agreement* %	K^‡	p value^†
IADL (/8)	–	–	–	–	89.38%	0.66	< 0.001
Sub-score 1 (/4), i.e., phone, transportation, medications, finance	–	–	–	–	89.47%	0.69	< 0.001
Sub-score 2 (/4), i.e., shopping, food, housekeeping, laundry	–	–	–	–	85.87%	0.62	< 0.001
IADL by item (autonomy: yes vs no)
Ability to use telephone	33	10	14	235	91.78	0.69	0.54
Shopping	212	27	15	38	85.62	0.56	0.09
Food preparation	209	31	8	44	86.64	0.61	< 0.001
Housekeeping	66	41	23	162	78.08	0.52	0.03
Laundry	137	30	16	109	84.25	0.68	0.054
Mode of transportation	170	23	11	88	88.36	0.75	0.06
Responsibility for own medications	188	13	21	70	88.36	0.72	0.23
Ability to handle finances	147	50	23	72	75.00	0.47	0.002
IADL according to the level of autonomy
8 IADL vs. 0	276	5	5	6	96.58	0.64	0.12
≥ 7 IADL vs. less	250	11	9	22	93.15	0.65	0.82
≥ 6 IADL vs. less	217	22	12	41	88.36	0.64	0.12
≥ 5 IADL vs. less	190	29	6	67	88.01	0.71	< 0.001
≥ 4 IADL vs. less	136	32	11	113	85.27	0.71	0.002
≥ 3 IADL vs. less	84	35	12	161	83.90	0.66	0.001
≥ 2 IADL vs. less	45	25	13	209	86.99	0.62	0.07
≥ 1 IADL vs. less	18	12	9	253	92.81	0.59	0.66
0 IADL vs. more	253	9	12	18	92.81	0.59	0.66

−/−: number of patients with no autonomy in face-to-face mode and no autonomy in telephone mode
−/+: number of patients with no autonomy in face-to-face mode and autonomy in telephone mode
+/−: number of patients with autonomy in face-to-face mode and no autonomy in telephone mode
+/+: number of patients with autonomy in face-to-face mode and autonomy in telephone mode
*Agreement was calculated as (a + d)/(a + b + c + d)
^†p value of McNemar test
^‡Linearly weighted Cohen’s kappa when more than 2 groups, i.e., IADL/8, sub-scores 1 and 2; unweighted Cohen’s kappa when 2 groups, i.e., IADL by item and IADL according to the level of autonomy

ISSN: 1758-9193