condition mean min max ZT0-3 0.6203203333333334 0.2975445 0.788377 ZT4-7 0.13592749999999998 0.13592749999999998 0.13592749999999998 ZT8-11 0.9120075 0.9120075 0.9120075 ZT12-15 3.6551175 3.04202 4.268215 ZT16-19 2.47585 2.47585 2.47585 ZT20-23 2.47818 2.47818 2.47818