Bland JM, Altman DG: Statistical methods for assessing agreement between two methods of clinical measurement. Lancet1: 307-310, 1986
2.
DeVellis RF: Scale Development: Theory and Applications. Applied Social Research Methods Series, Vol 26. Newbury Park, CA, Sage Publications, 1991
3.
Gehlbach SH: Interpreting the Medical Literature. Third edition. New York, McGraw-Hill, 1993
4.
Greenfield Mlvh , Kuhn JE, Wojtys EM: A statistics primer. Correlation and regression analysis. Am J Sports Med26: 338-343, 1998
5.
Greenfield Mlvh , Wojtys EM, Kuhn JE: A statistics primer. Tests for continuous data. Am J Sports Med25: 882-884, 1997
6.
Karras DJ: Statistical methodology: II. Reliability and validity assessment in study design, Part B. Acad Emerg Med4(2): 144-147, 1997
7.
Neer CS II: Displaced proximal humeral fractures. PartI. Classification and evaluation. J Bone Joint Surg52A: 1077-1089, 1970
8.
Stokes ME, Davis CS, Koch GG: Categorical Data Analysis Using the SAS System. Cary, NC , SAS Institute Inc, 1995, p 101
9.
Streiner DL, Norman GR: Health Measurement Scales: A Practical Guide to Their Development and Use . Second edition. Oxford, Oxford University Press, 1995
10.
Ware JE Jr, Sherbourne CD: The MOS 36-item short-form health survey (SF-36): I. Conceptual framework and item selection. Med Care30: 473- 483, 1992
