condition mean min max ZT0-3 60.150000000000006 60.150000000000006 60.150000000000006 ZT4-7 20.1 20.1 20.1 ZT8-11 24.0 24.0 24.0 ZT12-15 30.0 30.0 30.0 ZT16-19 93.05 93.05 93.05 ZT20-23 74.4 74.4 74.4