Nagoya City University Psychiatry



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Useful spreadsheets for daily evidence-based practices

From RCT into NNT [The NNT Calculator]
From ES into NNT
Based on Furukawa T. (1999) From effect size into number needed to treat. Lancet 353, 1680.
From RR and CER (or PEER) into NNT
CER=Control event rate (event rate in the control group), PEER=Patient expected event rate (event rate expected of this particular patient in the absence of treatment)
Based on Furukawa TA, Guyatt GH & Grifitth LE (2002). Can we individualize the Number Needed to Treat (NNT)? An empirical study of summary effect measures in meta-analyses. International Journal of Epidemiology 31, 72-76.
From OR and CER (or PEER) into RR & NNT
From diagnostic study into LR & SSLR
From pre-test probability & SSLR into post-test probability
This can be used instead of the famous Fagan nomogram.
95% confidence intervals for percentage (for studies on prognosis)

Dept of Psychiatry and Cognitive-Behavioral Medicne,
Nagoya City University Graduate School of Medical Sciences
Mizuho-cho, Mizuho-ku,
Nagoya 467-8601 JAPAN
Phone: +81-52-853-8271
Fax: +81-52-852-0837