condition mean min max ZT0-3 271.770518 271.770518 271.770518 ZT4-7 293.6985115 293.6985115 293.6985115 ZT8-11 318.03974900000003 318.03974900000003 318.03974900000003 ZT12-15 404.9808595 404.9808595 404.9808595 ZT16-19 344.3871105 344.3871105 344.3871105 ZT20-23 189.69017200000002 189.69017200000002 189.69017200000002