condition mean min max ZT0-3 3.1446625 2.155255 4.13407 ZT4-7 7.344950000000001 7.344950000000001 7.344950000000001 ZT8-11 3.13776 3.13776 3.13776 ZT12-15 0 0 0 ZT16-19 0.9531799999999999 0.9531799999999999 0.9531799999999999 ZT20-23 2.9810499999999998 2.9810499999999998 2.9810499999999998