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Table 3 Correlations between the duration of the disease, the total UPDRS score, HY staging and OCT parameters

From: Optical coherence tomography in patients with Parkinson’s disease

OCT parameters Duration of disease (years) UPDRS scores HY staging
(r) p value (r) p value (r) p value
RNFL thickness       
 Superonasal − 0.221 0.232 − 0.077 0.682 0.003 0.987
 Inferonasal − 0.201 0.278 − 0.108 0.564 − 0.028 0.879
 Nasal − 0.335 0.065 − 0.389 0.030* − 0.250 0.175
 Superior temporal − 0.308 0.092 − 0.210 0.258 − 0.241 0.191
 Inferior temporal − 0.319 0.080 − 0.328 0.072 − 0.399 0.026
 Temporal − 0.259 0.160 − 0.371 0.040* − 0.413 0.021*
Macular measurements       
 Central foveal thickness − 0.304 0.091 − 0.329 0.066 − 0.441 0.011*
 Superior parafoveal thickness − 0.337 0.059 − 0.219 0.228 − 0.433 0.013*
 Inferior parafoveal thickness − 0.387 0.029* − 0.391 0.027* − 0.605  < 0.001*
 Nasal parafoveal thickness − 0.341 0.056 − 0.391 0.027* − 0.649  < 0.001*
 Temporal parafoveal thickness − 0.401 0.023* − 0.321 0.073 − 0.544 0.001*
 Macular volume − 0.411 0.019* − 0.458 0.008* − 0.545 0.001*
GCC thickness       
 Average − 0.403 0.022* − 0.484 0.005* − 0.511 0.003*
 Superior − 0.421 0.017* − 0.476 0.006* − 0.482 0.005*
 Inferior − 0.358 0.044* − 0.460 0.008* − 0.515 0.003*
  1. UPDRS Unified Parkinson’s Disease Rating Scale, HY Hoehn and Yahr, OCT optical coherence tomography, RNFL retinal nerve fiber layer, GCC ganglion cell complex
  2. *Statistically significant