condition mean min max ZT0-3 393.103566 393.103566 393.103566 ZT4-7 392.88223949999997 392.88223949999997 392.88223949999997 ZT8-11 454.0305105 454.0305105 454.0305105 ZT12-15 473.99583900000005 473.99583900000005 473.99583900000005 ZT16-19 429.72362799999996 429.72362799999996 429.72362799999996 ZT20-23 476.32991849999996 476.32991849999996 476.32991849999996