Table 1: Beta estimates for health status measures collected at 2 follow-ups.

6 months postop.1 year postop.
Estimate (95% CI) valueEstimate (95% CI) value

UPDRS IIAge39−0.05 (−0.34, 0.23)0.7058320.03 (−0.3, 0.36)0.8438
Disease duration38−0.45 (−1.00, 0.11)0.1127310.21 (−0.56, 0.97)0.5859
BMI370.49 (0.04, 0.94)0.0332320.68 (−0.002, 1.37)0.0507
Laterality (versus unilateral)
 Staged bilateral391.16 (−4.58, 6.89)0.6849320.53 (−6.75, 7.82)0.8819
 Simultaneous bilateral39−3.68 (−12.69, 5.32)0.411832−5.46 (−14.34, 3.42)0.2179
Electrode passes (right)292.09 (−0.41, 4.60)0.0978241.96 (−1.77, 5.69)0.2876
Electrode passes (left)35−1.21 (−4.29, 1.87)0.430030−2.18 (−6.14, 1.78)0.2681
Electrode passes (total)360.31 (−1.15, 1.76)0.6731300.00 (−1.96, 1.97)0.9963
% equivalent levodopa dose371.83 (−3.93, 7.58)0.5233300.89 (−6.15, 7.94)0.7967
On UPDRS III390.09 (−0.21, 0.38)0.5535310.22 (−0.10, 0.54)0.1709
Tremor39−0.95 (−5.78, 3.88)0.6909321.35 (−4.41, 7.12)0.6345
Dyskinesia39−2.46 (−7.28, 2.36)0.307232−2.06 (−7.86, 3.74)0.4736
Freezing392.32 (−2.97, 7.62)0.3792323.85 (−2.55, 10.26)0.2284
Falls/balance396.48 (1.11, 11.84)0.0193326.45 (−0.38, 13.28)0.0634
Marital status38−1.86 (−7.35, 3.63)0.4958312.74 (−3.88, 9.36)0.4041

EQ-5D indexAge450.00 (−0.01, 0.00)0.3403360.00 (−0.01, 0.01)0.9897
Disease duration430.01 (0.00, 0.02)0.181035−0.01 (−0.02, 0.00)0.0696
BMI450.001 (−0.009, 0.011)0.845036−0.002 (−0.014, 0.011)0.7983
Laterality (versus unilateral)
 Staged bilateral440.08 (−0.02, 0.19)0.125236−0.01 (−0.14, 0.12)0.9127
 Simultaneous bilateral440.13 (−0.04, 0.29)0.1351360.003 (−0.15, 0.16)0.9654
Electrode passes (right)33−0.02 (−0.06, 0.02)0.349428−0.03 (−0.09, 0.04)0.3837
Electrode passes (left)380.04 (−0.02, 0.11)0.2006320.07 (0.00, 0.14)0.0508
Electrode passes (total)410.02 (−0.01, 0.05)0.2458340.01 (−0.03, 0.04)0.6988
Equivalent levodopa dose42−0.07 (−0.19, 0.04)0.2000340.06 (−0.06, 0.19)0.3138
On UPDRS III44−0.01 (−0.01, 0.00)0.0050350.00 (−0.01, 0.00)0.6310
Tremor440.03 (−0.07, 0.13)0.5516360.07 (−0.03, 0.17)0.1602
Dyskinesia44−0.01 (−0.11, 0.09)0.8448360.02 (−0.09, 0.12)0.7197
Freezing44−0.03 (−0.13, 0.08)0.595536−0.09 (−0.19, 0.01)0.0762
Falls/balance44−0.06 (−0.17, 0.05)0.26936−0.12 (−0.23, −0.02)0.0191
Marital status44−0.04 (−0.15, 0.08)0.499235−0.04 (−0.16, 0.07)0.4668