condition mean min max ZT0-3 4.4468163945 2.788071742 6.105561047 ZT4-7 10.9098826645 7.809418114 14.010347215 ZT8-11 10.466502515999998 10.4378052155 10.4951998165 ZT12-15 7.6956048005 7.1678538215 8.2233557795 ZT16-19 7.08135136225 6.070708671 8.0919940535 ZT20-23 9.8475107645 9.662307931 10.032713598