condition mean min max ZT0-3 7.2923170765 6.630402256 7.9542318970000006 ZT4-7 9.689562906333332 8.857064668666666 10.522061144 ZT8-11 9.08610335 8.886459511 9.285747189 ZT12-15 8.682096643833333 8.147437600666667 9.216755687 ZT16-19 8.8262807295 7.881292296000001 9.771269163 ZT20-23 8.205610116333334 7.4286953030000005 8.982524929666667