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NASS Summary Statistics

The following links provide summary statistics for the Nationwide Ambulatory Surgery Sample (NASS). Summary Statistics include means on all numeric variables, frequency distributions, and univariates on continuous variables. Summary statistics are provided by year.

Contents:

2021 NASS
2020 NASS
2019 NASS
2018 NASS
2017 NASS
2016 NASS

2021 NASS

SumStats NASS 2021 Encounter File, unweighted (PDF file, 245 KB)
SumStats NASS 2021 Encounter File, weighted (PDF file, 246 KB)
SumStats NASS 2021 Hospital File (PDF file, 131 KB)
SumStats NASS 2021 Supplemental File (PDF file, 106 KB)
SumStats NASS 2021 Diagnosis and Procedure Groups File, unweighted (PDF file, 188 KB)
SumStats NASS 2021 Diagnosis and Procedure Groups File, weighted (PDF file, 190 KB)

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2020 NASS

Encounter File, unweighted (PDF file, 234 KB)
Encounter File, weighted (PDF file, 235 KB)
Hospital File (PDF file, 130 KB)
Supplemental File (PDF file, 104 KB)
Diagnosis and Procedure Groups File, unweighted (PDF file, 182 KB)
Diagnosis and Procedure Groups File, weighted (PDF file, 185 KB)

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2019 NASS

Encounter File, unweighted (PDF file, 223 KB)
Encounter File, weighted (PDF file, 224 KB)
Hospital File (PDF file, 131 KB)
Supplemental File (PDF file, 166 KB)
Diagnosis and Procedure Groups File, unweighted (PDF file, 182 KB)
Diagnosis and Procedure Groups File, weighted (PDF file, 185 KB)

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2018 NASS

Encounter File, unweighted (PDF file, 208 KB)
Encounter File, weighted (PDF file, 208 KB)
Hospital File (PDF file, 113 KB)
Supplemental File (PDF file, 162 KB)
Diagnosis and Procedure Groups File, unweighted (PDF file, 179 KB)
Diagnosis and Procedure Groups File, weighted (PDF file, 181 KB)

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2017 NASS

Encounter File, unweighted (PDF file, 261 KB)
Encounter File, weighted (PDF file, 262 KB)
Hospital File (PDF file, 121 KB)
Supplemental File (PDF file, 201 KB)

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2016 NASS

Encounter File, unweighted (PDF file, 261 KB)
Encounter File, weighted (PDF file, 262 KB)
Hospital File (PDF file, 120 KB)
Supplemental File (PDF file, 201 KB)

Return to Contents

Internet Citation: NASS Summary Statistics. Healthcare Cost and Utilization Project (HCUP). April 2024. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nass/nasssummstats.jsp.

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Last modified 04/05/24