condition mean min max ZT0-3 25.084976 25.084976 25.084976 ZT4-7 24.492407 24.492407 24.492407 ZT8-11 23.321096 23.321096 23.321096 ZT12-15 21.381594999999997 21.381594999999997 21.381594999999997 ZT16-19 23.226756 23.226756 23.226756 ZT20-23 21.5558805 21.5558805 21.5558805