condition mean min max ZT0-3 11.99292 11.99292 11.99292 ZT4-7 11.448862 11.448862 11.448862 ZT8-11 11.4544505 11.4544505 11.4544505 ZT12-15 10.3884165 10.3884165 10.3884165 ZT16-19 9.6293005 9.6293005 9.6293005 ZT20-23 11.0441675 11.0441675 11.0441675