Table 5.

Classification rules extracted from the decision tree model; only rules with the condition fall = yes as consequent and which cover a number of at least 100 instances and have a related accuracy of at least 70% were considered; the rules are ordered by their relative accuracy

no.	rule (consequent: fall=yes)	relative accuracy
1a b	(Barthel index score ≤ 45 pts) and (sex = male) and (age > 75y) and (Lachs depression item = 0)	84.3% 77.8%
2	(Barthel index score > 10 and ≤ 45 pts) and (sex = female) and (number of medications < 14) and (MMSE score ≤ 26 pts) and (institutionalized=yes) and (needs aid for standing)	80.0%
3	(Barthel index score > 45 and ≤ 65 pts) and (MMSE score > 21 pts) and (Timed 'Up& Go' time ≤ 42s) and (number of diagnoses > 11) and (number of medications > 8)	72.8%
4	(Barthel index score > 45 and ≤ 65 pts) and (MMSE score ≤ 18 pts)	72.1%
5	(Barthel index score > 45 and ≤ 65 pts) and (MMSE score > 18 pts) and (Timed 'Up& Go' time > 42s) and (age > 71y)	71.9%