condition mean min max ZT0-3 5.26948 5.26948 5.26948 ZT4-7 2.902515 2.902515 2.902515 ZT8-11 1.18086 1.18086 1.18086 ZT12-15 1.614965 1.614965 1.614965 ZT16-19 5.560885000000001 5.560885000000001 5.560885000000001 ZT20-23 7.191045 7.191045 7.191045