condition mean min max ZT0-3 3.5620925 3.4304249999999996 3.69376 ZT4-7 6.742635 6.742635 6.742635 ZT8-11 5.107695 5.107695 5.107695 ZT12-15 0 0 0 ZT16-19 6.2765450000000005 6.2765450000000005 6.2765450000000005 ZT20-23 6.697135 6.697135 6.697135