Page 81 - The value of total hip and knee arthroplasties for patients
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                                Distinctiveness of Psychological Constructs
Results
Characteristics of the sample and internal consistency reliability of the subscales
A total of 745 patients were admitted for THA and 614 patients were admitted
for TKA from October 2010 to September 2012. Of these, 420 THA (63.2%) and
395 TKA (65.9%) patients consented to participate and completed the surveys. A
subgroup of 184 THA and 191 TKA patients, the ones enrolled in the study between
July 2011 and September 2012, received additional questionnaires including the
LOT-R, the HS and the CEQ. Of these, 14 had missing responses on all items and
were therefore excluded, leaving in total 361 patients for analysis (182 THA, 179
TKA). Characteristics of the subgroup of participants that completed the additional questionnaires and mean scores (sd) on the subscales of these questionnaires are 5 presented in table 2 for THA and TKA groups separately. In both TKA and THA
groups the majority of patients were females, the mean age was 67 years for both groups.The mean pain score was 41.9 forTHA patients and 39.7 forTKA patients. The mean functioning score (HOOS/KOOS ADL) was 43.8 for THA patients and 45.6 forTKA patients.THA patients on average scored 23.7 on the credibility and 22.5 on the expectancy subscale of the CEQ,TKA patients scored 23.5 and 22.1 on these subscales respectively. HS scores were 43.2 for THA and 41.3 for TKA patients. Optimism was scored 9.9 for THA patients and 10.0 for TKA patients, Pessimism scores were 10.8 for THA and 10.4 for TKA patients. Internal consistency reliability (lambda 2) of each of the subscales was acceptable (Table 2). For 14 patients responses on all items were missing and therefore they were excluded from analysis. All the questionnaire items had missing responses, though in most items < 7% responses were missing. An exception was one of the HS items which had 42% missing responses (item 6) due to a printing error in the questionnaire.The amount of data in the pairwise coefficients ranged between 0.57 and 0.98.
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