condition mean min max ZT0-3 1.7837299999999998 1.7837299999999998 1.7837299999999998 ZT4-7 2.1243499999999997 2.1243499999999997 2.1243499999999997 ZT8-11 1.16414 1.16414 1.16414 ZT12-15 1.495595 1.495595 1.495595 ZT16-19 1.34326 1.34326 1.34326 ZT20-23 1.27107 1.27107 1.27107