condition mean min max ZT0-3 1.84339402075 0.6876373575000001 2.999150684 ZT4-7 0.6592613137500001 0.6045915235 0.713931104 ZT8-11 2.188961084 1.1991538419999999 3.178768326 ZT12-15 8.62652810025 7.3544670805 9.89858912 ZT16-19 6.2183906780000004 5.444855257 6.991926099 ZT20-23 13.079320868749999 7.3760319325 18.782609805