condition mean min max ZT0-3 34.32138333333333 31.39135 36.813500000000005 ZT4-7 37.44465 37.44465 37.44465 ZT8-11 29.60015 29.60015 29.60015 ZT12-15 38.280024999999995 33.84475 42.7153 ZT16-19 40.45784999999999 40.45784999999999 40.45784999999999 ZT20-23 43.277249999999995 43.277249999999995 43.277249999999995