condition mean min max ZT0-3 139.141538 139.141538 139.141538 ZT4-7 115.6489765 115.6489765 115.6489765 ZT8-11 136.164352 136.164352 136.164352 ZT12-15 160.533842 160.533842 160.533842 ZT16-19 215.232925 215.232925 215.232925 ZT20-23 189.92632550000002 189.92632550000002 189.92632550000002