condition mean min max ZT0-3 1.06720575 1.0072665 1.127145 ZT4-7 1.944515 1.944515 1.944515 ZT8-11 1.4070844999999998 1.4070844999999998 1.4070844999999998 ZT12-15 0 0 0 ZT16-19 1.5189 1.5189 1.5189 ZT20-23 1.9880750000000003 1.9880750000000003 1.9880750000000003