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Table 2 Interaction Effects Analysis for Hospitalizations – Multiple Imputation Results

From: Effect of socio-demographic and health factors on the association between multimorbidity and acute care service use: population-based survey linked to health administrative data

Sex, Age Group

MMa Group

Correlate Group

Overall N (% with 1+ Hosp)

OR (95% CI)b

Inter.c (p-value)

Interaction #1: MM x Income

 Female, 65–74

0–1

>$80 k

640 (3)

Ref

0.11

$30 k-$79.9 k

1950 (7)

2.25 (1.39, 3.63)

<$30 k

1286 (6)

1.95 (1.18, 3.22)

2–3

>$80 k

507 (8)

Ref

$30 k-$79.9 k

1955 (10)

1.22 (0.86, 1.74)

<$30 k

1672 (11)

1.36 (0.96, 1.94)

4+

>$80 k

108 (15)

Ref

$30 k-$79.9 k

563 (16)

1.08 (0.60, 1.92)

<$30 k

749 (20)

1.42 (0.81, 2.48)

 Female, 75–84

0–1

>$80 k

210 (9)

Ref

0.20

$30 k-$79.9 k

937 (7)

0.82 (0.47, 1.41)

<$30 k

962 (10)

1.20 (0.71, 2.03)

2–3

>$80 k

285 (9)

Ref

$30 k-$79.9 k

1421 (15)

1.65 (1.08. 2.51)

<$30 k

1719 (15)

1.63 (1.08, 2.48)

4+

>$80 k

102 (20)

Ref

$30 k-$79.9 k

429 (23)

1.21 (0.71, 2.08)

<$30 k

773 (24)

1.32 (0.79, 2.21)

 Male, 65–74

0–1

>$80 k

911 (7)

Ref

0.52

$30 k-$79.9 k

1805 (7)

1.10 (0.80, 1.51)

<$30 k

804 (10)

1.61 (1.14, 2.28)

2–3

>$80 k

686 (11)

Ref

$30 k-$79.9 k

1752 (13)

1.26 (0.95, 1.66)

<$30 k

798 (14)

1.36 (0.99, 1.87)

4+

>$80 k

107 (16)

Ref

$30 k-$79.9 k

407 (23)

1.57 (0.89, 2.77)

<$30 k

279 (25)

1.77 (0.99, 3.19)

 Male, 75–84

0–1

>$80 k

253 (8)

Ref

0.65

$30 k-$79.9 k

866 (12)

1.47 (0.90, 2.41)

<$30 k

483 (16)

2.06 (1.24, 3.43)

2–3

>$80 k

350 (15)

Ref

$30 k-$79.9 k

1238 (17)

1.15 (0.83, 1.59)

<$30 k

616 (20)

1.34 (0.94, 1.90)

4+

>$80 k

97 (21)

Ref

$30 k-$79.9 k

400 (28)

1.46 (0.85, 2.50)

<$30 k

241 (30)

1.64 (0.93, 2.88)

Interaction #2: MM x Self-Perceived Mental Health

 Female, 65–74

0–1

Excellent

3192 (6)

Ref

0.97

Good

627 (7)

1.15 (0.81, 1.63)

Fair/Poor

57 (< 11)d

1.24 (0.44, 3.47)

2–3

Excellent

3040 (9)

Ref

Good

900 (12)

1.27 (1.00, 1.62)

Fair/Poor

194 (12)

1.31 (0.83, 2.06)

4+

Excellent

828 (17)

Ref

Good

415 (19)

1.12 (0.82, 1.52)

Fair/Poor

177 (20)

1.26 (0.83, 1.89)

 Female, 75–84

0–1

Excellent

1633 (8)

Ref

0.53

Good

435 (9)

1.12 (0.77, 1.63)

Fair/Poor

41 (17)

2.28 (0.99, 5.25)

2–3

Excellent

2404 (14)

Ref

Good

864 (15)

1.05 (0.84, 1.31)

Fair/Poor

257 (16)

1.17 (0.75, 1.82)

4+

Excellent

740 (23)

Ref

Good

383 (24)

1.04 (0.78, 1.40)

Fair/Poor

181 (23)

0.99 (0.68, 1.47)

 Male, 65–74

0–1

Excellent

2792 (8)

Ref

0.65

Good

643 (8)

1.06 (0.77, 1.46)

Fair/Poor

85 (13)

1.83 (0.96, 3.50)

2–3

Excellent

2257 (13)

Ref

Good

805 (12)

0.96 (0.75, 1.22)

Fair/Poor

174 (13)

1.05 (0.67, 1.66)

4+

Excellent

444 (21)

Ref

Good

242 (23)

1.10 (0.75, 1.60)

Fair/Poor

107 (29)

1.52 (0.94, 2.44)

 Male, 75–84

0–1

Excellent

1173 (12)

Ref

0.0009

Good

371 (13)

1.19 (0.84, 1.68)

Fair/Poor

58 (22)

2.20 (1.16, 4.19)

2–3

Excellent

1459 (17)

Ref

Good

597 (17)

1.03 (0.80, 1.33)

Fair/Poor

148 (30)

2.11 (1.45, 3.09)

4+

Excellent

407 (29)

Ref

Good

208 (30)

1.07 (0.74, 1.54)

Fair/Poor

123 (20)

0.61 (0.37, 1.00)

Interaction # 3: MM x Instrumental Activities of Daily Living

 Female, 65–74

0–1

Does not need help

3575 (5)

Ref

0.49

Needs help

301 (12)

2.48 (1.71, 3.61)

2–3

Does not need help

3372 (8)

Ref

Needs help

762 (17)

2.27 (1.81, 2.84)

4+

Does not need help

833 (14)

Ref

Needs help

587 (24)

1.92 (1.46, 2.52)

 Female, 75–84

0–1

Does not need help

1750 (8)

Ref

0.0001

Needs help

359 (12)

1.64 (1.14, 2.34)

2–3

Does not need help

2235 (10)

Ref

Needs help

1190 (22)

2.38 (1.96, 2.89)

4+

Does not need help

526 (22)

Ref

Needs help

778 (25)

1.18 (0.91, 1.54)

 Male, 65–74

0–1

Does not need help

3373 (7)

Ref

0.89

Needs help

147 (16)

2.33 (1.46, 3.70)

2–3

Does not need help

2895 (11)

Ref

Needs help

341 (22)

2.18 (1.64, 2.88)

4+

Does not need help

575 (18)

Ref

Needs help

218 (35)

2.42 (1.71, 3.44)

 Male, 75–84

0–1

Does not need help

1430 (11)

Ref

0.25

Needs help

172 (20)

1.98 (1.31, 2.96)

2–3

Does not need help

1752 (15)

Ref

Needs help

452 (29)

2.36 (1.85, 3.01)

4+

Does not need help

416 (23)

Ref

Needs help

322 (33)

1.68 (1.21, 2.33)

  1. a MM multimorbidity
  2. b OR (95% CI) = Odds Ratio of 1+ Hospitalization (95% Confidence Interval)
  3. c Inter Interaction
  4. d (%) with 1+ hospitalizations rounded upward to avoid reporting of small cell size
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BMC Health Services Research

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