Evidence-based design recommendations for prevalence studies on multimorbidity: improving comparability of estimates

Table 2 Descriptive statistics for the age groups included

Items	N	Mean	SD	Min	Max
Limits
Lower limit of age group given	104	50.7	24.5	0	85
Lower limit of age group imputed	4	15	n.a.	n.a.	n.a.
Upper limit of age group given	70	66.6	19.9	17	99
Upper limit of age group imputed	38	90	n.a.	n.a.	n.a.
Mean age^a	108	60.3	20	9	89.3
Size
No. of persons in age group	108	116,940	585,066	136	5,585,931
Prevalence
P2+ (2 or more chronic conditions)	102	46.6%	24.4	0.3%	98.7%
P3+ (3 or more chronic conditions)	76	28.7%	22.0	0.0%	95.7%

^aWhen mean age was not indicated, it was derived from the Human Mortality Database [16]

ISSN: 1478-7954