condition mean min max ZT0-3 4.953796666666666 3.9124999999999996 5.53734 ZT4-7 10.144770000000001 10.144770000000001 10.144770000000001 ZT8-11 30.0452 30.0452 30.0452 ZT12-15 35.17445 30.69945 39.64945 ZT16-19 19.17705 19.17705 19.17705 ZT20-23 10.925485 10.925485 10.925485