condition mean min max ZT0-3 3.1253925000000002 2.8350400000000002 3.4157450000000003 ZT4-7 3.266605 3.266605 3.266605 ZT8-11 4.34662 4.34662 4.34662 ZT12-15 0 0 0 ZT16-19 3.21442 3.21442 3.21442 ZT20-23 4.292275 4.292275 4.292275