condition mean min max ZT0-3 780.22921 780.22921 780.22921 ZT4-7 746.9798965 746.9798965 746.9798965 ZT8-11 890.4553505 890.4553505 890.4553505 ZT12-15 845.2639664999999 845.2639664999999 845.2639664999999 ZT16-19 941.3019485 941.3019485 941.3019485 ZT20-23 911.7180925 911.7180925 911.7180925