condition mean min max ZT0-3 938.138979 938.138979 938.138979 ZT4-7 706.249866 706.249866 706.249866 ZT8-11 710.6746515 710.6746515 710.6746515 ZT12-15 875.185379 875.185379 875.185379 ZT16-19 702.6823245 702.6823245 702.6823245 ZT20-23 939.3502625 939.3502625 939.3502625