condition mean min max ZT0-3 182.495603 182.495603 182.495603 ZT4-7 201.9557725 201.9557725 201.9557725 ZT8-11 270.2033465 270.2033465 270.2033465 ZT12-15 275.8935955 275.8935955 275.8935955 ZT16-19 209.7122315 209.7122315 209.7122315 ZT20-23 209.4137505 209.4137505 209.4137505