condition mean min max ZT0-3 37.881825 37.881825 37.881825 ZT4-7 41.900988 41.900988 41.900988 ZT8-11 49.3690625 49.3690625 49.3690625 ZT12-15 42.564342 42.564342 42.564342 ZT16-19 45.577467999999996 45.577467999999996 45.577467999999996 ZT20-23 37.442894499999994 37.442894499999994 37.442894499999994