Fig 1From: Socioeconomic status as a moderator between frailty and mortality at old agesComparison of age-specific distribution of frailty index between previous studies and the CLHLS in 2008/2009. Left panel obtained from Mitnitski et al. [72] with a permission. Right panel: authors’ own calculation from the CLHLS 2008/2009 to 2011/2012 waveBack to article page