condition mean min max ZT0-3 150.176005 150.176005 150.176005 ZT4-7 130.2773605 130.2773605 130.2773605 ZT8-11 149.94924450000002 149.94924450000002 149.94924450000002 ZT12-15 159.311261 159.311261 159.311261 ZT16-19 163.473623 163.473623 163.473623 ZT20-23 138.022261 138.022261 138.022261