condition mean min max ZT0-3 8.586500000000001 8.586500000000001 8.586500000000001 ZT4-7 5.64095 5.64095 5.64095 ZT8-11 5.426455 5.426455 5.426455 ZT12-15 7.43607 7.43607 7.43607 ZT16-19 10.03558 10.03558 10.03558 ZT20-23 9.068965 9.068965 9.068965