condition mean min max ZT0-3 292.348758 292.348758 292.348758 ZT4-7 655.7563695 655.7563695 655.7563695 ZT8-11 884.995881 884.995881 884.995881 ZT12-15 652.125542 652.125542 652.125542 ZT16-19 582.8290905 582.8290905 582.8290905 ZT20-23 542.153599 542.153599 542.153599