Paquid cohort data

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Description

PAQUID is a prospective cohort study initiated in 1988 in South Western France to explore functional and cerebral ageing. This sample includes n=2561 subjects. Data contains a time-to-event (minimum between time from enrolment to dementia onset and time from enrolment to death without dementia), a status indicator, and two cognitive scores measured at baseline.

Usage

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Format

A data frame with 2561 observations on the following 4 variables.

time

: the time-to-event (in years). It is defined as the minimum between time from enrolment to dementia onset and time from enrolment to death without dementia.

status

: the status indicator : 0 = censored, 1 = dementia onset and 2 = death without dementia.

DSST

: score at the Digit Symbol Substitution Score Test measured at baseline. This test explores attention and psychomotor speed.

MMSE

: score at the Mini Mental State Examination measured at baseline. This test is often used as an index of global cognitive performance.

References

Dartigues, J., Gagnon, M., Barberger-Gateau, P., Letenneur, L., Commenges, D., Sauvel, C., Michel, P., and Salamon, R. (1992). The paquid epidemiological program on brain ageing. Neuroepidemiology, 11(1):14–18.

Blanche, P., Dartigues, J. F., & Jacqmin-Gadda, H. (2013). Estimating and comparing time-dependent areas under receiver operating characteristic curves for censored event times with competing risks. Statistics in medicine, 32(30), 5381-5397.

Examples

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