condition mean min max ZT0-3 9.072832 9.072832 9.072832 ZT4-7 10.721605 10.721605 10.721605 ZT8-11 8.217908000000001 8.217908000000001 8.217908000000001 ZT12-15 8.577279 8.577279 8.577279 ZT16-19 8.243311 8.243311 8.243311 ZT20-23 7.6215055 7.6215055 7.6215055