condition mean min max ZT0-3 8.18576 8.18576 8.18576 ZT4-7 6.127655 6.127655 6.127655 ZT8-11 8.23106 8.23106 8.23106 ZT12-15 7.31063 7.31063 7.31063 ZT16-19 10.18845 10.18845 10.18845 ZT20-23 8.41525 8.41525 8.41525