condition mean min max ZT0-3 2.6584974999999997 2.4364049999999997 2.8805899999999998 ZT4-7 5.2912099999999995 5.2912099999999995 5.2912099999999995 ZT8-11 4.764305 4.764305 4.764305 ZT12-15 0 0 0 ZT16-19 3.65006 3.65006 3.65006 ZT20-23 3.46297 3.46297 3.46297