condition mean min max ZT0-3 97.928981 97.928981 97.928981 ZT4-7 102.281041 102.281041 102.281041 ZT8-11 126.90436700000001 126.90436700000001 126.90436700000001 ZT12-15 152.2031385 152.2031385 152.2031385 ZT16-19 155.0632015 155.0632015 155.0632015 ZT20-23 172.26477549999998 172.26477549999998 172.26477549999998