biofeedback {coxphw}

Biofeedback Treatment Data

Description

In this study the effect of biofeedback treatment on time until treatment success was evaluated in patients suffering from aspiration after head and neck surgery. The outcome of interest was the time from start of treatment until the patient achieved full swallowing rehabilitation (thdur). Patients were randomized into two groups (bfb): one group of patients received videoendoscopic biofeedback treatment; the other group received the conservative treatment including thermal stimulation with ice and exercises for the lips, tongue, laryngeal closure and elevation. Treatment was started as soon as the healing process after surgery was finished (thealing).

Usage

data(biofeedback)

Format

A data frame with 33 observations on the following 6 variables:

id

the patient id.

success

of treatment within the first 100 days; either 0 = no success or 1 = success.

thdur

the duration of therapy in days.

bfb

indicates the treatment group; either 0 = conservative or 1 = biofeedback.

theal

time from surgery to start of therapy in days.

log2heal

log2-transformed time from surgery to start of therapy.

Source

Data were supplied by Dr. D.-M. Denk, who gave permission to freely distribute the data and use them for non-commercial purposes.

References

Denk, D.-M. & Kaider, A. (1997). Videoendoscopic Biofeedback: A Simple Method to Improve the Efficacy of Swallowing Rehabilitation of Patients After Head and Neck Surgery. ORL J OTO-RHINO-LARY 59, 100-105.

Examples

data("biofeedback")

plot(survfit(Surv(thdur, success) ~ bfb, data = biofeedback), lty = 1:2, las = 1,
     xlab = "time (days)", ylab = "propability of success")
     
coxphw(Surv(thdur, success) ~ bfb, data = biofeedback,  template = "AHR")