condition mean min max ZT0-3 10.499571666666666 6.704745 17.293499999999998 ZT4-7 9.755334999999999 9.755334999999999 9.755334999999999 ZT8-11 5.28125 5.28125 5.28125 ZT12-15 6.896535 6.827170000000001 6.9658999999999995 ZT16-19 6.304345 6.304345 6.304345 ZT20-23 7.18673 7.18673 7.18673