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. 1999 Aug 21;319(7208):478–483. doi: 10.1136/bmj.319.7208.478

Table 3.

 Mortality over 13 years in elderly people in New Haven, CT, United States* by quarter of distribution of each type of activity

Quarter Social activity Productive activity Fitness activity
Low 74.0 85.6 74.0
Low-medium 69.6 74.0 69.8
Medium-high 62.5 61.2 62.4
High 53.7 50.9 55.2
*

Sample size at baseline was 2761 after deletion of cases with missing data. Percentages and sample sizes calculated with sudaan to account for complex sampling design.