condition mean min max ZT0-3 1.65995 1.42544 1.89446 ZT4-7 2.428825 2.428825 2.428825 ZT8-11 3.2639500000000004 3.2639500000000004 3.2639500000000004 ZT12-15 0 0 0 ZT16-19 2.44756 2.44756 2.44756 ZT20-23 2.168395 2.168395 2.168395