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(a) Ability to walk easily outdoors and (b) need for daily help among the participants of the Helsinki Ageing Study in 1989, 1999, 2009 and 2019 in 75-, 80-, 85- and 90+-year-old age groups (proportions with 95% confidence intervals; p for linearity, adjusted for sex). In (b), the scale is reversed so that smaller percentages indicate positive changes.
