condition mean min max ZT0-3 0.19300435000000002 0.03468555 0.410704 ZT4-7 0.319294 0.319294 0.319294 ZT8-11 0.3319885 0.3319885 0.3319885 ZT12-15 0.192047 0.066342 0.317752 ZT16-19 0.31436 0.31436 0.31436 ZT20-23 0.1074283 0.1074283 0.1074283