an increasing trendp = 0.11
There was no statistical evidence of an increasing trend over time ( p = 0.11).
There was no statistical evidence of an increasing trend over time ( p = 0.11).
The prevalence rates reported for Porto Alegre are similar to those observed in the present study; it is possible that the borderline level of statistical significance is influenced by the large sample size (more than 20,000 births per year), without indicating a substantial increase in prevalence.