condition mean min max ZT0-3 77.698452 77.698452 77.698452 ZT4-7 65.238904 65.238904 65.238904 ZT8-11 42.2618405 42.2618405 42.2618405 ZT12-15 42.872199 42.872199 42.872199 ZT16-19 35.801219 35.801219 35.801219 ZT20-23 38.666117 38.666117 38.666117