condition mean min max ZT0-3 29.637559545 29.13242098 30.142698109999998 ZT4-7 17.00901564 15.33105244 18.686978840000002 ZT8-11 11.3489386975 10.39446678 12.303410615 ZT12-15 12.215257704 11.220394458000001 13.21012095 ZT16-19 23.121209372499997 20.10377135 26.138647395 ZT20-23 33.840508235 30.872821575000003 36.808194895