neck_pain: Neck pain data set
In ordinalCont: Ordinal Regression Analysis for Continuous Scales

Description Usage Format Details References

A subset from an Australian chronic neck pain study

1	data(neck_pain)

A data frame with 264 rows and 4 variables

A randomized, double-blind, placebo-controlled study of low-level laser therapy (LLLT) in 88 subjects with chronic neck pain was conducted with the aim of determining the efficacy of 300 mW, 830 nm laser in the management of chronic neck pain. Subjects were randomized to receive a course of 14 treatments over 7 weeks with either active or sham laser to tender areas in the neck. The primary outcome measure was change in a 10 cm Visual Analogue Scale (VAS) for pain. Measurements were taken at baseline, at the end of 7 weeks\' treatment and 12 weeks from baseline.

The variables are as follows:

`id`	patient ID number
`vas`	Neck pain as recorded by the patient on a VAS scale, normalized to (0, 1)
`laser`	laser treatment received by patient, either 1 (active) or 2 (placebo)
`time`	the measurement time, either 1 (initial assessment), 2 (after 7 weeks) or 3 (after 12 weeks).

Chow RT, Heller GZ, Barnsley L (2006). “The effect of 300 mW, 830 nm laser on chronic neck pain: a double-blind, randomized, placebo-controlled study.” Pain, 124(1-2), 201-10. doi:16806710.

ordinalCont documentation built on Dec. 3, 2020, 1:06 a.m.