condition mean min max ZT0-3 6.2716075 5.683624999999999 6.85959 ZT4-7 1.9537750000000003 1.9537750000000003 1.9537750000000003 ZT8-11 3.5589399999999998 3.5589399999999998 3.5589399999999998 ZT12-15 0 0 0 ZT16-19 4.185305 4.185305 4.185305 ZT20-23 3.773565 3.773565 3.773565