condition mean min max ZT0-3 558.926421 558.926421 558.926421 ZT4-7 630.9009365 630.9009365 630.9009365 ZT8-11 688.130729 688.130729 688.130729 ZT12-15 651.549831 651.549831 651.549831 ZT16-19 678.3244235 678.3244235 678.3244235 ZT20-23 761.954204 761.954204 761.954204