condition mean min max ZT0-3 231.97074999999998 149.772 314.16949999999997 ZT4-7 120.05335 120.05335 120.05335 ZT8-11 147.9195 147.9195 147.9195 ZT12-15 0 0 0 ZT16-19 132.23685 132.23685 132.23685 ZT20-23 60.3327 60.3327 60.3327