condition mean min max ZT0-3 0.23553949999999998 0.1922915 0.27878749999999997 ZT4-7 0.5593525 0.5593525 0.5593525 ZT8-11 0.5583105 0.5583105 0.5583105 ZT12-15 0 0 0 ZT16-19 0.49305750000000004 0.49305750000000004 0.49305750000000004 ZT20-23 0.441233 0.441233 0.441233