condition mean min max ZT0-3 9.302885 9.302885 9.302885 ZT4-7 8.030090000000001 8.030090000000001 8.030090000000001 ZT8-11 6.471745 6.471745 6.471745 ZT12-15 6.100965 6.100965 6.100965 ZT16-19 7.566985000000001 7.566985000000001 7.566985000000001 ZT20-23 9.8522 9.8522 9.8522