Thought this was an interesting study, though there seem to be lots of similar ones:
Label Placement in Forms :: UXmatters
Interesting that people seem to like drop down list boxes in forms. But this last recommendation surprised me a bit:
Do others agree with that, or is a label important? How is accessibility affected by not having a label?Label placement for drop-down list boxes—To ensure users are immediately aware of what you’re asking for, instead of using a separate label, make the default value for a drop-down list box the label. This will work for very long lists of items, because a user already has the purpose of the input field in mind before the default value disappears.