condition mean min max ZT0-3 443.494242 443.494242 443.494242 ZT4-7 279.098472 279.098472 279.098472 ZT8-11 204.482204 204.482204 204.482204 ZT12-15 340.3104395 340.3104395 340.3104395 ZT16-19 366.23699650000003 366.23699650000003 366.23699650000003 ZT20-23 557.2432269999999 557.2432269999999 557.2432269999999