condition mean min max ZT0-3 0.6985778333333332 0.1599645 1.2277814999999999 ZT4-7 0.5260965 0.5260965 0.5260965 ZT8-11 0.5435855 0.5435855 0.5435855 ZT12-15 1.3793905 1.0278960000000001 1.730885 ZT16-19 1.2508 1.2508 1.2508 ZT20-23 1.291575 1.291575 1.291575