condition mean min max ZT0-3 0.035224 0.035224 0.035224 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.023892033333333337 0.023892033333333337 0.023892033333333337 ZT16-19 0.0 0.0 0.0 ZT20-23 0.15718000000000001 0.15718000000000001 0.15718000000000001