condition mean min max ZT0-3 117.489578 117.489578 117.489578 ZT4-7 207.258623 207.258623 207.258623 ZT8-11 221.276217 221.276217 221.276217 ZT12-15 122.431425 122.431425 122.431425 ZT16-19 102.903078 102.903078 102.903078 ZT20-23 77.652412 77.652412 77.652412