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

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

 Total (n = 292)   
n
−/− (a)
n
−/+ (b)
n
+/− (c)
n
+/+ (d)
Agreement* %Kp value
IADL (/8)89.38%0.66< 0.001
Sub-score 1 (/4), i.e., phone, transportation, medications, finance89.47%0.69< 0.001
Sub-score 2 (/4), i.e., shopping, food, housekeeping, laundry85.87%0.62< 0.001
IADL by item (autonomy: yes vs no)
 Ability to use telephone33101423591.780.690.54
 Shopping21227153885.620.560.09
 Food preparation2093184486.640.61< 0.001
 Housekeeping66412316278.080.520.03
 Laundry137301610984.250.680.054
 Mode of transportation17023118888.360.750.06
 Responsibility for own medications18813217088.360.720.23
 Ability to handle finances14750237275.000.470.002
IADL according to the level of autonomy
 8 IADL vs. 027655696.580.640.12
 ≥ 7 IADL vs. less2501192293.150.650.82
 ≥ 6 IADL vs. less21722124188.360.640.12
 ≥ 5 IADL vs. less1902966788.010.71< 0.001
 ≥ 4 IADL vs. less136321111385.270.710.002
 ≥ 3 IADL vs. less84351216183.900.660.001
 ≥ 2 IADL vs. less45251320986.990.620.07
 ≥ 1 IADL vs. less1812925392.810.590.66
 0 IADL vs. more2539121892.810.590.66
  1. −/−: number of patients with no autonomy in face-to-face mode and no autonomy in telephone mode
  2. −/+: number of patients with no autonomy in face-to-face mode and autonomy in telephone mode
  3. +/−: number of patients with autonomy in face-to-face mode and no autonomy in telephone mode
  4. +/+: number of patients with autonomy in face-to-face mode and autonomy in telephone mode
  5. *Agreement was calculated as (a + d)/(a + b + c + d)
  6. p value of McNemar test
  7. 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