condition mean min max ZT0-3 137.642794 137.642794 137.642794 ZT4-7 231.182174 231.182174 231.182174 ZT8-11 188.7012285 188.7012285 188.7012285 ZT12-15 174.260471 174.260471 174.260471 ZT16-19 137.4473395 137.4473395 137.4473395 ZT20-23 132.680275 132.680275 132.680275