condition mean min max ZT0-3 46.150000000000006 46.150000000000006 46.150000000000006 ZT4-7 7.2 7.2 7.2 ZT8-11 48.15 48.15 48.15 ZT12-15 25.9 25.9 25.9 ZT16-19 37.55 37.55 37.55 ZT20-23 34.7 34.7 34.7