condition mean min max ZT0-3 0.15682858333333333 0.04147055 0.3383092 ZT4-7 0.1216886 0.1216886 0.1216886 ZT8-11 0.5786535500000001 0.5786535500000001 0.5786535500000001 ZT12-15 0.42577524999999994 0.249531 0.6020194999999999 ZT16-19 0.3538395 0.3538395 0.3538395 ZT20-23 0.614126 0.614126 0.614126