# BCII: Stata module to to estimate the number needed to treat (NNT) and confidence intervals for patients improving, or ‘benefiting’ (either improvements gained or deteriorations prevented), in a randomised controlled trial

*Robert Froud* ()

Statistical Software Components from Boston College Department of Economics

**Abstract:**
Estimation of absolute risk reduction and number needed to treat for the difference between the proportion of improving patients in an intervention group and the proportion of improving patients a control group of a clinical trial. The package uses a method that is considered to have superior coverage properties to the conventional Wald method for calculating confidence intervals (Newcombe's Method 10); this may be important when reciprocally transforming absolute risk reductions to obtain numbers needed to treat (NNTs) as described by Bender, 2001. The program also estimates NNTs for benefit; the difference between the proportion of improving patients minus the proportion of deteriorating patients in the intervention group and the proportion of improving patients minus the proportion of deteriorating patients in the control group. Newcombe’s method 10 has been modified to incorporate these extra variance terms as described by Froud et al, 2009.

**Language:** Stata

**Requires:** Stata version 10.1

**Keywords:** number needed to treat; NNT; Wilson scores (search for similar items in EconPapers)

**Date:** 2009-06-02

**Note:** This module should be installed from within Stata by typing "ssc install bcii". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.

**References:** Add references at CitEc

**Citations:** Track citations by RSS feed

**Downloads:** (external link)

http://fmwww.bc.edu/repec/bocode/b/bcii.ado program code (text/plain)

http://fmwww.bc.edu/repec/bocode/b/bcii.sthlp help file (text/plain)

http://fmwww.bc.edu/repec/bocode/b/bcib.ado program code (text/plain)

http://fmwww.bc.edu/repec/bocode/b/bcib.sthlp help file (text/plain)

**Related works:**

This item may be available elsewhere in EconPapers: Search for items with the same title.

**Export reference:** BibTeX
RIS (EndNote, ProCite, RefMan)
HTML/Text

**Persistent link:** https://EconPapers.repec.org/RePEc:boc:bocode:s457053

**Ordering information:** This software item can be ordered from

http://repec.org/docs/ssc.php

Access Statistics for this software item

More software in Statistical Software Components from Boston College Department of Economics Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA. Contact information at EDIRC.

Bibliographic data for series maintained by Christopher F Baum ().