condition mean min max ZT0-3 5.330584999999999 5.330584999999999 5.330584999999999 ZT4-7 3.8194350000000004 3.8194350000000004 3.8194350000000004 ZT8-11 3.370765 3.370765 3.370765 ZT12-15 4.295085 4.295085 4.295085 ZT16-19 5.8329450000000005 5.8329450000000005 5.8329450000000005 ZT20-23 6.310695000000001 6.310695000000001 6.310695000000001