condition mean min max ZT0-3 54.8581 54.8581 54.8581 ZT4-7 89.42405 89.42405 89.42405 ZT8-11 39.442899999999995 39.442899999999995 39.442899999999995 ZT12-15 18.970750000000002 18.970750000000002 18.970750000000002 ZT16-19 22.5913 22.5913 22.5913 ZT20-23 31.0187 31.0187 31.0187