condition mean min max ZT0-3 104.961926 104.961926 104.961926 ZT4-7 70.0437745 70.0437745 70.0437745 ZT8-11 74.355638 74.355638 74.355638 ZT12-15 264.68807649999997 264.68807649999997 264.68807649999997 ZT16-19 93.3638545 93.3638545 93.3638545 ZT20-23 174.212089 174.212089 174.212089