condition mean min max ZT0-3 7.7 7.7 7.7 ZT4-7 14.8 14.8 14.8 ZT8-11 40.150000000000006 40.150000000000006 40.150000000000006 ZT12-15 16.25 16.25 16.25 ZT16-19 14.15 14.15 14.15 ZT20-23 25.1 25.1 25.1