Trippolini M A, Dijkstra P U, Geertzen J H B, Reneman M F
Department of Work Rehabilitation, Rehaklinik Bellikon, Suva Care, 5454, Bellikon, Switzerland,
J Occup Rehabil. 2015 Sep;25(3):527-36. doi: 10.1007/s10926-014-9559-9.
To extensively analyze the measurement properties the Spinal Function Sort (SFS) in patients with sub-acute whiplash-associated disorders (WAD).
Three-hundred-two patients with WAD were recruited from an outpatient work rehabilitation center. Internal consistency was assessed by Cronbach's α. Construct validity was tested based on eight a priori hypotheses. Structural validity was measured with principal component analysis (PCA). Test-retest reliability and agreement was evaluated in a sub sample (n = 32) using intraclass correlation coefficient (ICC) and limits of agreement (LoA). The predictive validity of SFS for future work status at 1, 3, 6, and 12 months follow-up was determined by area under the curve (AUC) of receiver operating characteristics. Non-return to work (N-RTW) was defined with two cut-off points: workcapacity <50 and <100 %.
N-RTW decreased from 50%, 1 month follow-up, to 14%, 12 months follow-up. Cronbach's α was 0.98, PCA revealed evidence for unidimensionality. ICC was 0.86, LoA was ±33 points. Seven out of eight hypotheses for construct validity were not rejected. AUC reduced with a longer follow-up from 0.71 for 1 month to 0.61 at 12 months, for cut-off point <50%. For cut-off point <100% these values were 0.71 and 0.59.
In patients with sub-acute WAD test-retest reliability, internal consistency, construct- and structural validity of the SFS were adequate. LoA were substantial. Sensitivity to accurately predict N-RTW was poor. The predictive validity of the SFS for N-RTW of patients with sub-acute WAD from an outpatient work rehabilitation setting was only sufficient for the short term (1 month).
广泛分析亚急性挥鞭样损伤相关疾病（WAD）患者的脊柱功能分类（SFS）测量属性。
从门诊工作康复中心招募了302例WAD患者。采用Cronbach's α评估内部一致性。基于八个先验假设检验结构效度。用主成分分析（PCA）测量结构效度。在一个子样本（n = 32）中使用组内相关系数（ICC）和一致性界限（LoA）评估重测信度和一致性。通过接受者操作特征曲线下面积（AUC）确定SFS对1、3、6和12个月随访时未来工作状态的预测效度。非重返工作岗位（N-RTW）用两个临界点定义：工作能力<50%和<100%。
N-RTW从随访1个月时的50%降至随访12个月时的14%。Cronbach's α为0.98，PCA显示单维度性证据。ICC为0.86，LoA为±33分。八个结构效度假设中的七个未被拒绝。对于临界点<50%，AUC随着随访时间延长从1个月时的0.71降至12个月时的0.61。对于临界点<100%，这些值分别为0.71和0.59。
在亚急性WAD患者中，SFS的重测信度、内部一致性、结构和结构效度是足够的。LoA较大。准确预测N-RTW的敏感性较差。门诊工作康复环境中亚急性WAD患者SFS对N-RTW的预测效度仅在短期内（1个月）足够。
