Skip to main content

Table 1 Distributional skewness and false alarm rates for potential outlier check by IQR, MAD, and FAST-MCD approaches for selected NDNQI indicators

From: Input data quality control for NDNQI national comparative statistics and quarterly reports: a contrast of three robust scale estimators for multiple outlier detection

NDNQI indicators Skewness
(γ)
False alarm rates by different approach
Target IQR MAD FAST-MCD
Total Falls Per 1,000 Patient Days 1.772 2.5% 3.97% 3.50% 5.55%
Total Injury Falls Per 1,000 Patient Days 3.064 2.5% 4.15% 4.88% 28.34%
Percent of Total Nursing Hours Provided by RNs 2.412 2.5% 5.58% 7.25% 30.34%
Total Hospital Acquired Pressure Ulcer 3.608 2.5% 6.61% 10.24% 49.04%
Total Number of Ulcers 2.456 2.5% 3.49% 2.80% 16.69%
Average Pain Assessments in 24 Hours 1.622 2.5% 8.08% 7.38% 8.78%
Prior Risk Assessment for Pressure Ulcers −1.675 2.5% 14.97% -* 48.01%
Total Nursing Hours per Patient Day 1.533 2.5% 6.02% 9.22% 21.57%
Percent Vesicant PIV 1.172 2.5% 7.44% - -
Assisted Falls 1.267 2.5% 7.76% - -
Assault Rate 4.568 2.5% 9.23% 12.62% 34.46%
PIV-Multiple Sites 3.828 2.5% - - -
  1. * denote the method failed and led to missing values for the statistic.