condition mean min max ZT0-3 6.95298 6.95298 6.95298 ZT4-7 3.1092899999999997 3.1092899999999997 3.1092899999999997 ZT8-11 4.13351 4.13351 4.13351 ZT12-15 10.148035 10.148035 10.148035 ZT16-19 11.081925 11.081925 11.081925 ZT20-23 9.085429999999999 9.085429999999999 9.085429999999999