condition mean min max ZT0-3 248.185604 248.185604 248.185604 ZT4-7 220.536642 220.536642 220.536642 ZT8-11 314.46727450000003 314.46727450000003 314.46727450000003 ZT12-15 212.94680950000003 212.94680950000003 212.94680950000003 ZT16-19 309.49098000000004 309.49098000000004 309.49098000000004 ZT20-23 310.2182415 310.2182415 310.2182415