TABLE 2.

Odds ratios for placebo-associated improvement in dyskinesia, showing influences of shifts in the three prognostic baseline factors

Age (yr)	Baseline UPDRS motor score	Baseline daily L-dopa (mg)	Probability	Odds	Odds ratio relative to first row
66	22.4	780	0.37	0.59	1.00
66 + 10	22.4	780	0.42	0.72	1.24
66 − 10	22.4	780	0.32	0.47	0.81
66	22.4 + 10 pts	780	0.32	0.47	0.80
66	22.4 − 10 pts	780	0.42	0.72	1.25
66	22.4	780 + 300	0.33	0.52	0.86
66	22.4	780 − 300	0.40	0.69	1.17
66 + 10	22.4 − 10 pts	780 − 300	0.51	1.07	1.80
66 − 10	22.4 + 10 pts	780 + 300	0.25	0.33	0.55

Bold markings highlight the influence of shifting the identified factor upwards or downwards, and the final two rows show the probability of showing placebo-associated improvement with all three factors shifted in the direction of maximally enhancing (second from the bottom row) or maximally diminishing (the bottom row) placebo response. Probability (P) of obtaining the response and the odds of obtaining the response (P/1 – P) are mathematically related, but shown separately.