condition mean min max ZT0-3 93.276727 93.276727 93.276727 ZT4-7 161.5891725 161.5891725 161.5891725 ZT8-11 206.4711835 206.4711835 206.4711835 ZT12-15 223.090256 223.090256 223.090256 ZT16-19 180.9395705 180.9395705 180.9395705 ZT20-23 168.595396 168.595396 168.595396