condition mean min max ZT0-3 38.712424 38.712424 38.712424 ZT4-7 38.916267500000004 38.916267500000004 38.916267500000004 ZT8-11 45.838898 45.838898 45.838898 ZT12-15 36.0945945 36.0945945 36.0945945 ZT16-19 50.547506999999996 50.547506999999996 50.547506999999996 ZT20-23 52.2867145 52.2867145 52.2867145