condition mean min max ZT0-3 400.552783 400.552783 400.552783 ZT4-7 331.8051425 331.8051425 331.8051425 ZT8-11 286.75545350000004 286.75545350000004 286.75545350000004 ZT12-15 309.96146699999997 309.96146699999997 309.96146699999997 ZT16-19 362.281427 362.281427 362.281427 ZT20-23 323.9645465 323.9645465 323.9645465