13. Cohen J. A coefficient of agreement for nominal scales. Educational and 1960;20:37-46. Psychological Measurement 14. Frenea S, Chirossel C, Rodriguez R. The effects of prolonged ambulation on labor with epidural analgesia. Obstetric Anesthesia2004;98:224-229. 15. Karraz MA. Ambulatory epidural anaesthesia and the duration of labour. International Journal of Gynecology and Obstetrics 2003;80:117-122. 16. MacLennan AH, Crowther C, Derham R. Does the option to ambulate during spontaneous labour confer any advantage or disadvantage? Journal of Maternal andFetal Medicine1994;3:43-48. 17. Godfrey A, Culhane KM, Lyons GM. Comparison of the performance of the physical activity logger to a discrete accelerometer- activPAL™ Professional based activity monitor. Medical Engineering & Physics 2007;29:930-934. 18. Grant PM, Dall PM, Mitchell SL, Granat MH. Activity-monitor accuracy in measuring step number and cadence in community-dwelling older adults. Journal of Aging and Physical Activity2008;16:201-14. 19. Ryan C, Gray H, Newton M, Granat MH. The convergent validity of free-living physical activity monitoring as an outcome measure of functional ability in people with chronic low back pain. Journal of Back and Musculoskeletal Rehabilitation 2008;21:137-142. 20. Mickelborough J, Kenney L, Moss S.Validation of a novel activity monitor. Proceedings Recent Advances in Assistive Technology and Engineering (RAATE).Conference, Birmingham, UK,10-11:2003. (Supporting Information: Appendix S1): Histograms showing frequency of rating by (n=95)
13. Cohen J. A coefficient of agreement for nominal scales. Educational and Psychological Measurement 1960;20:37-46. 14. Frenea S, Chirossel C, Rodriguez R. The effects of prolonged ambulation on labor with epidural analgesia. Obstetric Anesthesia2004;98:224-229. 15. Karraz MA. Ambulatory epidural anaesthesia and the duration of labour. International Journal of Gynecology and Obstetrics 2003;80:117-122. 16. MacLennan AH, Crowther C, Derham R. Does the option to ambulate during spontaneous labour confer any advantage or disadvantage? Journal of Maternal andFetal Medicine1994;3:43-48. 17. Godfrey A, Culhane KM, Lyons GM. Comparison of the performance of the activPAL™ Professional physical activity logger to a discrete accelerometer- based activity monitor. Medical Engineering & Physics 2007;29:930-934. 18. Grant PM, Dall PM, Mitchell SL, Granat MH. Activity-monitor accuracy in measuring step number and cadence in community-dwelling older adults. Journal of Aging and Physical Activity2008;16:201-14. 19. Ryan C, Gray H, Newton M, Granat MH. The convergent validity of free-living physical activity monitoring as an outcome measure of functional ability in people with chronic low back pain. Journal of Back and Musculoskeletal Rehabilitation 2008;21:137-142. 20. Mickelborough J, Kenney L, Moss S.Validation of a novel activity monitor. Proceedings Recent Advances in Assistive Technology and Engineering (RAATE).Conference, Birmingham, UK,10-11:2003. (Supporting Information: Appendix S1): Histograms showing frequency of rating by (n=95)
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