Before revision: In a retrospective observational study conducted in 1999, while there wasn't significant difference in time for second and third stage of labour, the "mean time in first stage of labour is also substantially lower in the raspberry leaf group".
After revision: In a retrospective observational study conducted in 1999, while there was not significant difference in time for second and third stage of labour, the "mean time in first stage of labour is also substantially lower in the raspberry leaf group".