condition mean min max ZT0-3 4.529945 4.529945 4.529945 ZT4-7 4.69879 4.69879 4.69879 ZT8-11 2.198445 2.198445 2.198445 ZT12-15 3.8867899999999995 3.8867899999999995 3.8867899999999995 ZT16-19 3.59079 3.59079 3.59079 ZT20-23 4.352025 4.352025 4.352025