The only reliable conclusion is the c.20% who thought humans developed over millions of years after being created less than 10,000 years ago were really, really confised.
The questions were poorly worded. Those people were most likely trying to get through to the thick-headed pollsters that yes, humans developed over millions of years, but they were Created by God, not just arising out of nothing, or with God as just some guiding hand.
The respondents were never given the option of responding that God created Man and that Man evolved. The pollsters took the ignorant and idiotic position that evolution and creation are incompatible.