Objective: To assess the incompleteness of the Robson Classification variables in the Live Birth Information System (Sistema de Informacao sobre Nascidos Vivos - SINASC), in the state of Parana, and its trend, 20142020. Methods: This was a time -series study that analyzed six variables, according to health macro -regions. Incompleteness was classified (percentage of "ignored" and "blank fields") as follows: excellent (< 1.0%); good (1.0-2.9%); regular (3.0-6.9%); poor (>= 7.0%). Prais-Winsten regression was used to estimate trends. Results: A total of 1,089,116 births were evaluated. The variable "cesarean section before the onset of labor" was classified as poor in 2014 (39.4%) and 2015 (44.3%) in the state and in all macro -regions, but with a decreasing trend in incompleteness. The variables "gestational age" in the North and Northwest macro -regions, and "parity" and "number of fetuses" in the Northwest macro -region showed an increasing trend. Conclusion: Most of the variables evaluated showed low percentages of incompleteness with a decreasing trend, but there is a need to improve the completion of some variables.
