condition mean min max ZT0-3 4.33765 4.33765 4.33765 ZT4-7 4.804410000000001 4.804410000000001 4.804410000000001 ZT8-11 3.05905 3.05905 3.05905 ZT12-15 3.8409950000000004 3.8409950000000004 3.8409950000000004 ZT16-19 4.7982 4.7982 4.7982 ZT20-23 4.17648 4.17648 4.17648