condition mean min max ZT0-3 1.2600615 1.1378080000000002 1.382315 ZT4-7 1.7766084999999998 1.7766084999999998 1.7766084999999998 ZT8-11 1.671615 1.671615 1.671615 ZT12-15 0 0 0 ZT16-19 1.550956 1.550956 1.550956 ZT20-23 1.81549 1.81549 1.81549