You have already ruined your poll and skewed the results.
When you ask a question like "Are you interested in XXXX?" you attract people who are interested in XXXX, and most of those who aren't will simply move on, not taking your poll. This is how special interests groups skew results in their favor of their ideas. You have probably seen news stories with words like "The overwhelming majority of people who responded to our poll are in favor of banning religion from schools." or "The overwhelming majority of people who responded to our poll are believe the world is flat."
If you word a poll so it will attract only people who agree with your idea, you can have a poll that favors anything.
I bet right now the number of people answering Yes to your pole is probably 2 to 1 in favor of medium capacity diapers. However, if you had started this thread with " Gathering Interest for a super capacity Diaper " and made the first question of your poll " Are you interested in a supper capacity diaper" the results would look the same in favor of the super capacity diaper.
If you actually want to know if people are interested in a medium capacity diaper, you have to be careful to never mention any specific capacity, unless you mention all possible capacities. try this instead:
Gathering Information for a New Adult Diaper
and your poll would look like this:
Do you or someone in your family wear Adult diapers?
Y?
N?
What capacity do you wear most often?
<1L?
1L?
2L?
3L?
4L?
5L?
>5L?
What capacity do think is most undeserved by the market?
<1L?
1L?
2L?
3L?
4L?
5L?
>5L?
If a new diaper came to market, what capacity would most interest you?
<1L?
1L?
2L?
3L?
4L?
5L?
>5L?