condition mean min max ZT0-3 11.27335 11.27335 11.27335 ZT4-7 2.5222350000000002 2.5222350000000002 2.5222350000000002 ZT8-11 0.5321665 0.5321665 0.5321665 ZT12-15 2.732915 2.732915 2.732915 ZT16-19 16.47985 16.47985 16.47985 ZT20-23 20.9326 20.9326 20.9326