condition mean min max ZT0-3 5798.183303 5798.183303 5798.183303 ZT4-7 2951.965809 2951.965809 2951.965809 ZT8-11 2961.8362965 2961.8362965 2961.8362965 ZT12-15 3230.621378 3230.621378 3230.621378 ZT16-19 4482.8779429999995 4482.8779429999995 4482.8779429999995 ZT20-23 4354.6789455 4354.6789455 4354.6789455