condition mean min max ZT0-3 233.06537 233.06537 233.06537 ZT4-7 155.329011 155.329011 155.329011 ZT8-11 142.9949885 142.9949885 142.9949885 ZT12-15 173.037653 173.037653 173.037653 ZT16-19 220.5652645 220.5652645 220.5652645 ZT20-23 212.9189225 212.9189225 212.9189225