Table 3

Operationalised criteria for delirium (C) 1, when applied to the Cuban population based study data set, by clinical dementia status

Prevalence (%) in those with clinically diagnosed dementia N = 130

Prevalence (%) (high education controls) N = 50

Prevalence (%) (low education controls) N = 95


C criterion requires that the deficits do not occur exclusively during the course of a delirium


C_1 no onset in the last month,

    and

100

98

100

C_2 no sudden onset in 1–3 days,

    and

93

94

93

C_3 not changeable over 24 hours, alert at one time, drowsy and confused the next,

    or

75

85

87

C_4 no confusion worse towards night or evening

52

70

61


1. Only ascertained among those with a current episode characterized by functional and cognitive decline

Prince et al. BMC Public Health 2008 8:219   doi:10.1186/1471-2458-8-219

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