condition mean min max ZT0-3 2.8707925000000003 2.8515050000000004 2.89008 ZT4-7 1.7531949999999998 1.7531949999999998 1.7531949999999998 ZT8-11 1.98455 1.98455 1.98455 ZT12-15 0 0 0 ZT16-19 5.29654 5.29654 5.29654 ZT20-23 3.2031349999999996 3.2031349999999996 3.2031349999999996