condition mean min max ZT0-3 4.2133575 4.128885 4.297829999999999 ZT4-7 4.11512 4.11512 4.11512 ZT8-11 3.5397499999999997 3.5397499999999997 3.5397499999999997 ZT12-15 0 0 0 ZT16-19 3.78193 3.78193 3.78193 ZT20-23 4.474475 4.474475 4.474475