condition mean min max ZT0-3 688.649595 688.649595 688.649595 ZT4-7 572.556108 572.556108 572.556108 ZT8-11 566.32446 566.32446 566.32446 ZT12-15 764.058721 764.058721 764.058721 ZT16-19 753.1397919999999 753.1397919999999 753.1397919999999 ZT20-23 461.72461599999997 461.72461599999997 461.72461599999997