condition mean min max ZT0-3 209.432453 209.432453 209.432453 ZT4-7 236.77522900000002 236.77522900000002 236.77522900000002 ZT8-11 240.05452100000002 240.05452100000002 240.05452100000002 ZT12-15 288.533866 288.533866 288.533866 ZT16-19 271.535297 271.535297 271.535297 ZT20-23 243.21132699999998 243.21132699999998 243.21132699999998