If you've not already completed it, the online handedness survey is still open.

It takes only a minute to complete.

Survey: http://www.parkinsonsmeasurement.org...ess/survey.htm

Raw results: http://www.parkinsonsmeasurement.org...ss/results.xml

Statistical summary: http://www.parkinsonsmeasurement.org...ss/summary.htm

91 people with IPD have provided data which includes -
left hand dominant, left hand first symptoms: 6
left hand dominant, right hand first symptoms: 4
right hand dominant, left hand first symptoms: 36
right hand dominant, right hand first symptoms: 45

The difference for men and woman in the time between first presenting with PD symptoms and the IPD diagnosis being given has already been reported. See:
http://neurotalk.psychcentral.com/thread163231.html

Have a look at the statistical summary page. Can you see anything else interesting?

John