condition mean min max ZT0-3 32.772166666666664 21.71545 39.540099999999995 ZT4-7 23.15315 23.15315 23.15315 ZT8-11 20.95925 20.95925 20.95925 ZT12-15 32.47855 30.9328 34.0243 ZT16-19 31.557850000000002 31.557850000000002 31.557850000000002 ZT20-23 41.8138 41.8138 41.8138