condition mean min max ZT0-3 2.3540574999999997 1.795945 2.9121699999999997 ZT4-7 1.717025 1.717025 1.717025 ZT8-11 1.79004 1.79004 1.79004 ZT12-15 0 0 0 ZT16-19 2.579475 2.579475 2.579475 ZT20-23 3.2870600000000003 3.2870600000000003 3.2870600000000003