condition mean min max ZT0-3 137.983681 137.983681 137.983681 ZT4-7 119.7573375 119.7573375 119.7573375 ZT8-11 127.6429705 127.6429705 127.6429705 ZT12-15 132.293139 132.293139 132.293139 ZT16-19 174.0055715 174.0055715 174.0055715 ZT20-23 148.725441 148.725441 148.725441