condition mean min max ZT0-3 35.965411 35.965411 35.965411 ZT4-7 36.723597999999996 36.723597999999996 36.723597999999996 ZT8-11 42.677925 42.677925 42.677925 ZT12-15 40.416591 40.416591 40.416591 ZT16-19 47.4961445 47.4961445 47.4961445 ZT20-23 42.480892999999995 42.480892999999995 42.480892999999995