condition mean min max ZT0-3 136.693595 136.693595 136.693595 ZT4-7 138.28143599999999 138.28143599999999 138.28143599999999 ZT8-11 124.2838125 124.2838125 124.2838125 ZT12-15 144.0269675 144.0269675 144.0269675 ZT16-19 121.11175499999999 121.11175499999999 121.11175499999999 ZT20-23 155.5628875 155.5628875 155.5628875