condition mean min max ZT0-3 6312.695897 6312.695897 6312.695897 ZT4-7 8460.183179 8460.183179 8460.183179 ZT8-11 8624.2590145 8624.2590145 8624.2590145 ZT12-15 8528.983499 8528.983499 8528.983499 ZT16-19 9239.261364 9239.261364 9239.261364 ZT20-23 7328.922705 7328.922705 7328.922705