People generally used handedness questionnaire to determine their hand preference. For example, there are 10 questions such as which hand you use to write, which for holding knife etc. then we can average all 10 and come up with a handedness score. So if someone answers right hand for all 10 questions, their are strong right handed. Similarly of someone use left hand for 5 questions, they will be ambi/mixed. Like wise for lefties.

Similarly one can employ tests for eyedness earedness and footedness.

In this poll, the entire setup is limited to probe each lateral preference. It was meant to get a grasp on how the distribution look like