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Table 3 Methodological quality of included trials*

From: Interventions to prevent disability in frail community-dwelling elderly: a systematic review

  Descriptive Statistical Internal Validity Total Validity
Study 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ? +
Binder, 2002 + + + + - + + + + + ? ? + - + + 2 6
Boshuizen, 2005 + + - + - + + + ? ? ? + + - + + 3 5
Chandler, 1998 + + - + - + - + ? + ? ? + + + + 3 6
Chin A Paw, 2001 + + + + - + + + ? + ? + - - + + 2 5
Gill, 2002 + + + + - + + + ? + ? + + + + + 2 7
King, 2002 + + + + - + + + ? + ? - + - + + 2 5
Kretser, 2003 + + - + - + + ? - ? ? ? ? + + + 5 3
Payette, 2002 + + - + - + + + ? + ? - + + + + 2 6
Timonen, 2004 + + - + + + - + ? + ? + ? + + + 3 6
Worm, 2001 + - - + - + - + - ? ? + ? + + + 3 5
  1. * '+' criterion fulfilled; '-' criterion not fulfilled; and '?' data not provided or unclear.
  2. see table 2 for a detailed description of the items.