Table 3. Odds ratios of factors for quartiles of neck flexion angle.
| 2nd quartile | 3rd quartile | 4th quartile | ||||||||||||||||||||
| Predictable variables | OR (95% CI) | p | OR (95% CI) | p | OR (95% CI) | p | ||||||||||||||||
| Age | /Year | 0.88 | ( | 0.56 | – | 1.38 | ) | 0.57 | 0.77 | ( | 0.49 | – | 1.22 | ) | 0.27 | 0.97 | ( | 0.61 | – | 1.53 | ) | 0.89 |
| Sex | Male Female (Ref) | 2.01 1 | ( | 0.92 | – | 4.35 | ) | 0.08 | 1.08 1 | ( | 0.49 | – | 2.39 | ) | 0.85 | 1.07 1 | ( | 0.49 | – | 2.34 | ) | 0.87 |
| Orthopedic spinal lesions | Yes No (Ref) | 1.07 1 | ( | 0.38 | – | 2.98 | ) | 0.90 | 0.77 1 | ( | 0.27 | – | 2.18 | ) | 0.62 | 0.84 1 | ( | 0.32 | – | 2.20 | ) | 0.72 |
| Hoehn-Yahr | III, IV I, II (Ref) | 0.79 1 | ( | 0.35 | – | 1.78 | ) | 0.57 | 1.73 1 | ( | 0.78 | – | 3.88 | ) | 0.18 | 2.99 | ( | 1.33 | – | 6.7 | ) | 0.008 |
| 1 | ||||||||||||||||||||||
| The reference category is: 1st quartile. | ||||||||||||||||||||||
predictable variables: forced entry (age, sex, and orthopedic lesions), forward stepwise likelihood ratio test (duration of PD, H-Y, history of psychosis, history of agonist-related AP, UPDRS-3, Dopa dose, DA agonist dose, amantadine use, selegiline use, and rehabilitation).