condition mean min max ZT0-3 1.3212727499999999 1.2514705 1.3910749999999998 ZT4-7 2.365705 2.365705 2.365705 ZT8-11 1.984935 1.984935 1.984935 ZT12-15 0 0 0 ZT16-19 1.8667099999999999 1.8667099999999999 1.8667099999999999 ZT20-23 2.5167849999999996 2.5167849999999996 2.5167849999999996