OBJEKTIVE: To analyze changing trends of cesarean section (CS) birth rates in Norway during an 8-year period (2003-2010) using the Robson Ten Group Classification System.
DESIGN: Register study
SETTING: Medical Birth Registry of Norway
SAMPLE/POPULATION: All deliveries registered in the Medical Birth Registry of Norway between 1st of January 2003 and 31st of December 2010. The study population comprised 460 140 women, of whom 75 276 women gave birth by caesarean section.
METHODS: Data from the Medical Birth Registry of Norway was collected and used to describe caesarean section rates during the study period.
RESULTS: The general increase in caesarean section rate in Norway is moderate during the years of 2003-2010. However, the increase is markedly higher among standard nullipara and multipara with previous caesarean section.
The distribution of births within Robson groups has changed over the 8-year period, pointing towards an increase in the level of induced births and repeated caesarean section.
The differences in overall caesarean section rate among some of the institutions are not necessarily applicable in the individual Robson groups.
CONCLUSION: The level of caesarean section in Robson 1 is the most important group to consider in the perspective of maintaining a moderate caesarean section rate in Norway.