condition mean min max ZT0-3 2.01439975 0.8180795000000001 3.21072 ZT4-7 3.0078500000000004 3.0078500000000004 3.0078500000000004 ZT8-11 11.7585 11.7585 11.7585 ZT12-15 0 0 0 ZT16-19 8.57485 8.57485 8.57485 ZT20-23 2.152785 2.152785 2.152785