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Table 1 The Mean and median of disability index and rank correlation between disability index of 1996

From: Increase of mild disability in Japanese elders: A seven year follow-up cohort study

  year 1996 1997 1998 1999 2000 2001 2002
Male (n = 453) Mean 0.006 0.006 0.010 0.012 0.015 0.018 0.027
  SD 0.035 0.034 0.053 0.058 0.060 0.067 0.080
  Median 0.003 0.003 0.003 0.004 0.007 0.008 0.012
  Correlation*   0.629 0.475 0.433 0.363 0.324 0.327
  P   <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
Female (n = 747) Mean 0.007 0.009 0.009 0.011 0.016 0.022 0.036
  SD 0.031 0.032 0.035 0.043 0.055 0.061 0.082
  Median 0.005 0.006 0.006 0.007 0.010 0.014 0.020
  Correlation*   0.615 0.521 0.460 0.363 0.324 0.256
  P   <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
  1. *Spearman's rank correlation between disability index of 1996