Cervix 1 was 27.4 + / - 8.4 mm and 29.6 + / - 8.9 mm ( p = 0.14 ) , cervix 2 was 23.3 + / - 8.8 mm and 23.8 + / - 8.5 mm ( p = 0.28 ) and cervical shortening was 5 + / - 4 mm and 5 + / -4 mm ( p = 0.446 ) , time to onset of labor was 6.3 + / - 4.6 and 5.7 + / - 4.7 ( p = 0.38 ) and duration of labor was 5.8 + / - 2.89 and 5.7 + / - 2.4 ( p = 0.82 ) for the sweeping and the control groups , respectively