condition mean min max ZT0-3 2456.98 2456.98 2456.98 ZT4-7 2766.8500000000004 2766.8500000000004 2766.8500000000004 ZT8-11 3478.8900000000003 3478.8900000000003 3478.8900000000003 ZT12-15 3932.0600000000004 3932.0600000000004 3932.0600000000004 ZT16-19 2867.23 2867.23 2867.23 ZT20-23 2746.755 2746.755 2746.755