Re-examination of successful agers with lower biological than chronological age still after a 20-year follow-up period

Table 4 Concordance of personal biological age and clinical assessment, the eyeball test

	Clinical assessment, the eyeball test^e
n = 110^a	Younger than their chronological age	Same as their chronological age
Personal biological age in relation to chronological age	n
Personal biological age younger than chronological age	68	25
Personal biological age same as^b or older than chronological age	4	13
Sensitivity (95% CI)^c	0.73 (0.63–0.81)
Specificity (95% CI)^c	0.76 (0.53–0.90)
Positive predictive value (95% CI)^d	0.94 (0.87–0.98)
Negative predictive value (95% CI)^d	0.34 (0.21–0.50)

CI Confidence Interval; Wilson method
^aThe clinical assessment was missing for one participant and in addition, for one participant, the personal biological age was not possible to count
^bPersonal biological age was considered the same as chronological age if they were within a year of each other
^cSensitivity and specificity of the eyeball test in identifying participants with a PBA younger than their CA from participants with PBA the same as CA or PBA older than CA
^dPositive and negative predictive value for the eyeball test when identifying participants as seeming younger than their chronological age from participants with PBA the same as CA or PBA older than CA
^eNone of the participants were clinically assessed as seeming older than their chronological age

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