a significant trendP < 0.01
In the study period, there was a significant trend towards an increase in Stages 0, I and IV ( P < 0.01) and a trend towards a decrease in Stages IIA, IIB and IIIB ( P < 0.001).
In the study period, there was a significant trend towards an increase in Stages 0, I and IV ( P < 0.01) and a trend towards a decrease in Stages IIA, IIB and IIIB ( P < 0.001).