condition mean min max ZT0-3 3.9215124999999995 3.56875 4.274274999999999 ZT4-7 4.0781849999999995 4.0781849999999995 4.0781849999999995 ZT8-11 4.4031 4.4031 4.4031 ZT12-15 0 0 0 ZT16-19 4.885785 4.885785 4.885785 ZT20-23 4.262765 4.262765 4.262765