condition mean min max ZT0-3 44.277799 44.277799 44.277799 ZT4-7 36.9576665 36.9576665 36.9576665 ZT8-11 48.054179 48.054179 48.054179 ZT12-15 64.640072 64.640072 64.640072 ZT16-19 44.063527500000006 44.063527500000006 44.063527500000006 ZT20-23 62.555333499999996 62.555333499999996 62.555333499999996