condition mean min max ZT0-3 1.485125 1.485125 1.485125 ZT4-7 0.9953125 0.9953125 0.9953125 ZT8-11 1.245935 1.245935 1.245935 ZT12-15 2.028485 2.028485 2.028485 ZT16-19 2.992235 2.992235 2.992235 ZT20-23 1.491965 1.491965 1.491965