condition mean min max ZT0-3 0.0218113965 0.0 0.043622793 ZT4-7 0.0 0.0 0.0 ZT8-11 0.023980578333333332 0.0 0.047961156666666664 ZT12-15 0.012654161166666665 0.0 0.02530832233333333 ZT16-19 0.010074712000000001 0.0 0.020149424000000003 ZT20-23 0.0 0.0 0.0