Kristian Thorborg's Phd Thesis

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DEFINITIONS Construct validity The degree to which the scores of a measurement instrument are consistent with a priori hypotheses, based on the assumption that the instrument validly measures the construct to be measured.[1] Criterion validity The degree to which scores of a measurement instrument are an adequate reflection of a “gold standard”.[1] Disability Disability in this thesis encompasses the health dimensions within the methodological framework of The International Classification of Functioning, Disability and Health (ICF) as categorized in one of three levels; impairment (body structure and function), activity limitations (activities), and participation restrictions (participation).[2] Internal consistency The degree of interrelatedness among the items e.g. in a questionnaire.[1] Longstanding hip and/or groin pain Pain in the hip and groin region of more than 6 weeks’ duration is defined as longstanding in nature.[3] Measurement error (variation) The systematic and random error (variation) of a patient’s score that is not attributed to true changes in the construct to be measured.[1] 4
Patient-Reported Outcome (PRO) A PRO is any report coming directly from patients about a health condition and its treatment.[4,5] PRO questionnaires include items, instructions and guidelines for scoring and interpretation and are used to measure these patient reports.[4,5] Physical activity and inactivity Physical activity refers to “any force exerted by skeletal muscles that results in energy expenditure above resting level”.[6] Physical inactivity is defined as less than 2.5 hours per week of moderate activity.[7] In this thesis an individual doing any physical activity above resting level, for at least 2.5 hours a week, is referred to as physically active. Psychometric properties Psychometrics is the discipline concerned with measurement of variables in tests and questionnaires and has more recently been introduced in health-related fields.[8] Psychometric properties in this thesis are defined as measurement properties of tests concerning validity, reliability, and responsiveness. Psychometric theory Classical test theory and item response theory are different expressions of psychometric theory. Classical test theory assumes that an observed score may be decomposed into a “true” score and an “error” score. The term "classical" is seen in contrast to the more recent psychometric theories such as item response theory. Item response theory has also been used to develop and internally validate measures. Item response theory assumes that the test-scale is unidimensional and creates an interval-scaled measure.[8] Reliability The extent to which scores for the same patients are unchanged for repeated measurements over time.[1] 5
Page 1 and 2: F A C U L T Y O F H E A L T H S C I
Page 3 and 4: I shall be telling this with a sigh
Page 5 and 6: ACKNOWLEDGEMENTS First of all I wou
Page 7 and 8: LIST OF PUBLICATIONS 2 ABBREVIATION
Page 9: ABBREVIATIONS ABD Abduction ADD Add
Page 13 and 14: THESIS AT A GLANCE Study Question M
Page 15 and 16: playing organised football, and tha
Page 17: evaluated in these studies (Table 1
Page 20 and 21: Muscle strength testing Muscle stre
Page 22 and 23: lower arms between the feet of the
Page 24 and 25: Eccentric strength testing has show
Page 26 and 27: from patients about a health condit
Page 28 and 29: AIMS AND HYPOTHESES The overall aim
Page 30 and 31: Study selection Two reviewers (KT a
Page 32 and 33: Characteristics of studies and inst
Page 34 and 35: the reviewers had overlooked specif
Page 36 and 37: Figure 10. Flowchart of the study p
Page 38 and 39: Figure 11. Clinical study profile I
Page 40 and 41: term “hip and/or groin”, we bel
Page 42 and 43: test-retest ICC should be � 0.70
Page 44 and 45: Floor and ceiling effects are prese
Page 46 and 47: Table 7. Baseline characteristics 4
Page 48 and 49: item, and/or a test-retest reliabil
Page 50 and 51: Testing the final version of HAGOS
Page 52 and 53: Responsiveness As hypothesized, cha
Page 54 and 55: STUDY III Clinical assessment of hi
Page 56 and 57: etest. Relative reliability is the
Page 58 and 59: external rotation-sitting position
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andomised before the testing sessio
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Hip torque values are shown in Figu
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DISCUSSION This thesis is based on
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Development of a new patient-report
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Construct validity (HAGOS) Validati
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minimal change, the estimates fall
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without causing stabilisation probl
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Groin pain affecting muscle strengt
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CONCLUSION � Reliable, valid and
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SUMMARY Clinical outcome measures f
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assessment of symptoms, activity li
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undersøgelse (studie III) var form
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REFERENCES 1. Mokkink LB, Terwee CB
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30. Birrell F, Lunt M, Macfarlane G
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59. Stratford PW, Balsor BE. A comp
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89. Martin RL, Irrgang JJ, Burdett
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115. Thorborg K, Roos E, Bartels EM
Page 94 and 95:
143. Byrd JW, Jones KS. Arthroscopi
Page 96 and 97:
168. Lequesne MG, Mery C, Samson M,
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Kristian Thorborg's Phd Thesis

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