condition mean min max ZT0-3 47.703521 47.703521 47.703521 ZT4-7 54.131503 54.131503 54.131503 ZT8-11 61.728092000000004 61.728092000000004 61.728092000000004 ZT12-15 58.204807 58.204807 58.204807 ZT16-19 44.7896905 44.7896905 44.7896905 ZT20-23 40.598665 40.598665 40.598665