Stillbirth rates in pregnancies presenting decreased fetal movements. Statistical process control chart presenting the monthly stillbirth rates and means during the baseline quality assessment period and the intervention period. The arrow indicates the time (seventh month of intervention) at which a significant change was documented during the intervention.
Tveit et al. BMC Pregnancy and Childbirth 2009 9:32 doi:10.1186/1471-2393-9-32