Investigators were able to visualize a significantly greater percentage of the cervix using the sheathed speculum compared with the standard speculum ( 95.1 % 8.2 % vs. 78.2 % 18.4 % ; P < 0.001 ) , representing a 21.6 % improvement in visualization , and were able to visualize the entire cervix in 42 ( 61.8 % ) patients when using the sheathed speculum compared with 11 ( 16.4 % ) patients undergoing standard speculum examination ( P < 0.001 ) .