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Longitudinal Data
(Select from the criteria below to view unit data charts of NNAP results from 2014 to 2020, for any neonatal unit or network.)
Please note that from 2017 data onwards, we report outlier analysis and main report measures using a “no imputation” approach. By this we mean that rates of adherence to standards, or rates of clinical outcomes are described for the babies where the outcome is known. This means that from 2017 onwards the results may not be directly comparable with results from 2016, 2015 and 2014 as displayed in the annual report, unit and network data sections and poster downloads. In previous years missing data were counted as negative outcomes or non-adherence to standards.
All outlier data and longitudinal outlier data (available from 2015-2019) are reported using the “no imputation” approach for all years, so are comparable. For more information about the NNAP measures, please see the current NNAP annual report and the NNAP measures guides.
The NNAP audit measures
For a full description of the NNAP audit measures please visit www.rcpch.ac.uk/nnap
Understanding the caterpillar plots
In a caterpillar plot, units are presented from left to right in the ascending order of their performance on the measure, with the most adherent shown on the right side of the graph. The performance on the measure (compliance) is shown by the vertical axis. Each unit is represented by a dot, with a vertical bar above and below the dot representing uncertainty (statistically the 95% confidence interval) in this measurement of performance.
Although units are ranked for presentation, the purpose of the plot is to demonstrate the variation rather than to describe differences between units with statistical confidence. Readers should therefore use these plots to assert differences between units with caution because the observed differences may have arisen by chance.
“Treatment effect” is the difference between the rate of BPD or death in babies cared for in a neonatal network compared to the observed rate for a matched group of babies with very similar case mix, cared for in all neonatal units. A positive treatment effect indicates that the rate of BPD or death is higher in the network of interest than for a comparable group of babies cared for in all neonatal units. Where the 95% confidence interval for this effect excludes 0, the treatment effect is unlikely to be a chance finding.
Treatment effect is not displayed for Special care Units because initial management of very preterm infants in Special care Units is, by definition, not planned and because Special care Units are unlikely to have sufficient numbers of very preterm infants attributed to them to make rates of BPD readily interpretable