condition mean min max ZT0-3 165.363075 165.363075 165.363075 ZT4-7 205.467957 205.467957 205.467957 ZT8-11 229.86931699999997 229.86931699999997 229.86931699999997 ZT12-15 163.483277 163.483277 163.483277 ZT16-19 144.7118355 144.7118355 144.7118355 ZT20-23 101.444841 101.444841 101.444841