condition mean min max ZT0-3 9.95079 9.10083 10.8859 ZT4-7 5.547725 5.547725 5.547725 ZT8-11 5.689349999999999 5.689349999999999 5.689349999999999 ZT12-15 7.255915 6.1203199999999995 8.39151 ZT16-19 5.922515000000001 5.922515000000001 5.922515000000001 ZT20-23 10.9465 10.9465 10.9465