condition mean min max ZT0-3 429.13607 429.13607 429.13607 ZT4-7 241.464094 241.464094 241.464094 ZT8-11 315.6464505 315.6464505 315.6464505 ZT12-15 283.8457465 283.8457465 283.8457465 ZT16-19 255.149673 255.149673 255.149673 ZT20-23 203.1187625 203.1187625 203.1187625