condition mean min max ZT0-3 18.6005861725 17.6339102 19.567262145 ZT4-7 13.9744321975 13.705601085000001 14.243263310000001 ZT8-11 18.2290388675 13.73488049 22.723197245 ZT12-15 29.5743540675 27.27338608 31.875322054999998 ZT16-19 28.710454 28.509654925 28.911253075 ZT20-23 27.4806319625 25.87108971 29.090174214999998