condition mean min max ZT0-3 24.031452 24.031452 24.031452 ZT4-7 251.6960285 251.6960285 251.6960285 ZT8-11 328.51518999999996 328.51518999999996 328.51518999999996 ZT12-15 145.3913115 145.3913115 145.3913115 ZT16-19 92.220869 92.220869 92.220869 ZT20-23 77.262517 77.262517 77.262517