Table 1.

Characteristics of the study population according to the two samples (absolute numbers and rounded %)

	Cross-sectional sample a ( n  = 428)		Longitudinal sample b ( n  = 219)
	n	%	n	%
Age
75—79	190	44.4	48	21.9
80—84	139	32.5	106	48.4
85—89	73	17.1	50	22.8
90  +	26	6.1	15	6.8
Sex
Male	199	46.5	91	41.6
Female	229	53.5	128	58.4
Partner status
Partner	257	60.0	110	50.2
No partner	171	40.0	109	49.8
Education level
Low	161	37.6	90	41.1
Middle	160	37.4	75	34.2
High	107	25.0	54	24.7
Housing
Independent	391	98.5	212	98.1
Dependent	6	1.5	4	1.9

^aResponse between June 9, 2020 and October 8, 2020

^bCharacteristics of fixed variables were measured at baseline (at inclusion in wave J). Age was reported as a mean age between the covid measurement and the third wave of the 75 PLUS study