condition mean min max ZT0-3 2.0289099999999998 2.0289099999999998 2.0289099999999998 ZT4-7 2.595295 2.595295 2.595295 ZT8-11 3.411185 3.411185 3.411185 ZT12-15 2.2266649999999997 2.2266649999999997 2.2266649999999997 ZT16-19 1.33188 1.33188 1.33188 ZT20-23 1.362025 1.362025 1.362025