condition mean min max ZT0-3 2.70405390475 2.3150661269999997 3.0930416825 ZT4-7 4.8071646845 4.247835518 5.366493851 ZT8-11 6.558545648499999 6.324376797999999 6.792714499 ZT12-15 3.73598851525 2.4316635415 5.040313489 ZT16-19 2.6081293465 2.4114152805 2.8048434125 ZT20-23 3.5610857345 3.4203030020000003 3.701868467