condition mean min max ZT0-3 3.27434864675 2.0121486455 4.536548648 ZT4-7 2.34625324275 0.953726362 3.7387801235 ZT8-11 26.398363489 16.399415648 36.39731133 ZT12-15 79.9317716525 74.793905415 85.06963789 ZT16-19 51.3754571225 50.451574205 52.299340040000004 ZT20-23 41.23584264750001 40.930987290000004 41.540698005