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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.