condition mean min max ZT0-3 8.16543 8.16543 8.16543 ZT4-7 8.882670000000001 8.882670000000001 8.882670000000001 ZT8-11 6.6934000000000005 6.6934000000000005 6.6934000000000005 ZT12-15 6.81184 6.81184 6.81184 ZT16-19 7.418965 7.418965 7.418965 ZT20-23 4.55893 4.55893 4.55893