Self-reported versus health administrative data: implications for assessing chronic illness burden in populations. A cross-sectional study

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Figure 1
Prevalence of multimorbidity with self-reported data, health administrative data (HAD) and the 2 data sources pooled together, according to number of chronic conditions considered in the operational definition of multimorbidity.

Table 1: Sociodemographic characteristics of participants

Characteristic	No. (%) of participants n = 1177
Age group, yr
25-34	120 (10.2)
35-44	182 (15.5)
45-54	295 (25.1)
55-64	343 (29.1)
65-75	223 (18.9)
Missing	14 (1.2)
Female	684 (58.1)
Education
No high school diploma	248 (21.1)
High school or college diploma	614 (52.2)
University diploma	310 (26.3)
Missing	5 (0.4)

Table 2: Frequency of chronic conditions by self-report and with health administrative data, and agreement between the 2 data sources

Chronic condition	Prevalence, %	Total no. of participants*	Method; no. (%) of participants			κ (95% CI)
Chronic condition	Prevalence, %	Total no. of participants*	Self-report	Health administrative data	Both methods	κ (95% CI)
Diabetes	10.5	124	109 (87.9)	104 (83.9)	89 (71.8)	0.82 (0.76 to 0.88)
Thyroid disorder	13.1	154	147 (95.4)	77 (50.0)	70 (45.4)	0.59 (0.51 to 0.67)
Hypertension	34.9	411	363 (88.3)	260 (63.3)	212 (51.6)	0.57 (0.52 to 0.62)
Any cardiac disease	12.0	141	111 (78.7)	87 (61.7)	57 (40.4)	0.54 (0.45 to 0.62)
Cancer	8.5	100	45 (45.0)	92 (92.0)	37 (37.0)	0.52 (0.41 to 0.62)
Asthma	12.6	148	129 (87.2)	63 (42.6)	44 (29.7)	0.42 (0.33 to 0.51)
Arthrosis	28.6	337	290 (86.1)	127 (37.7)	80 (23.7)	0.28 (0.21 to 0.34)
Rheumatoid arthritis	4.8	57	35 (61.4)	33 (57.9)	11 (19.3)	0.30 (0.16 to 0.45)
Osteoporosis	6.6	78	71 (91.0)	22 (28.2)	15 (19.2)	0.30 (0.18 to 0.43)
Chronic obstructive pulmonary disease	6.3	74	54 (73.0)	31 (41.9)	11 (14.9)	0.23 (0.11 to 0.36)
Intestinal disease	9.9	116	97 (83.6)	34 (29.3)	15 (12.9)	0.19 (0.1 to 0.29)
Hypercholesterolemia	28.6	337	332 (98.5)	17 (5.0)	12 (3.6)	0.04 (0.01 to 0.07)

Note: CI = confidence interval.

*Total number of participants with the condition who were identified either by self-report or by health administrative data.

Table 3: Comparison of agreement by age group

Chronic condition	Age; κ (95% CI)
Chronic condition	< 65 yr	65-75 yr
Diabetes	0.85 (0.77 to 0.91)	0.74 (0.62 to 0.86)
Hypertension	0.59 (0.52 to 0.65)	0.42 (0.30 to 0.53)
Thyroid disorder	0.60 (0.50 to 0.69)	0.58 (0.43 to 0.72)
Any cardiac disease	0.57 (0.46 to 0.67)	0.44 (0.29 to 0.57)
Cancer	0.52 (0.40 to 0.63)	0.52 (029 to 0.72)
Asthma	0.40 (0.29 to 0.50)	0.49 (0.26 to 0.69)
Arthrosis	0.26 (0.19 to 0.34)	0.26 (0.13 to 0.38)
Rheumatoid arthritis	0.38 (0.20 to 0.54)	0.08 (-0.05 to 0.32)
Osteoporosis	0.39 (0.24 to 0.55)	0.12 (-0.03 to 0.33)
Chronic obstructive pulmonary disease	0.22 (0.07 to 0.37)	0.25 (0.03 to 0.47)
Intestinal disease	0.20 (0.09 to 0.31)	0.19 (0.01 to 0.38)
Hypercholesterolemia	0.05 (0.01 to 0.09)	0.04 (0.00 to 0.08)