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Table 4 Risk of bias of included trials

From: The progression rate of peripheral arterial disease in patients with intermittent claudication: a systematic review

Source of bias
First author Allocation concealment Selective recruitment Incomplete outcome data Survival selection Summary risk of bias
Naschitz 1988 [27] yes yes no yes high
Walsh (1991) [21] yes yes no no moderate
Fowkes (1993) [25] yes yes no yes high
Whyman (1993) [30] No No yes No low
Bird (1999) [26] yes yes yes yes High
Smith (1998) [29] No yes yes yes high
Smith (2003) [28] No yes yes yes high
Aquino (2005) [24] no yes no yes moderate