Web users are, for the most part, used to giving out personal information online, especially in exchange for content they want. But certain kinds of information are more sensitive than others.
If you're capturing leads for your laser clinic or medical spa, here's some info from Hubspot that show how asking for certain type of information can reduce the number of contacts or leads that you're able to capture.
Here are some of the findings.
Forms asking for any type of geographic location have lower converstion rates than forms that do not, but mailing addresses seem to be much more sensitive since the perception is that visitors filling out the form will receive mail.
Asking for a telephone number has much the same impact as asking for a mailing address... a decrease in the number of completed forms.
Oddly, at least to me, it seems that asking a visitors age is also sensitive enough to prevent form completions.
So what should you do?
First, don't try to swallow the entire apple, just take a bite and begin to add value. Remember that they're filling out your form in order to receive value from you. If you don't provide any value at all and just spam them with offers, your relationship will sour quickly.