condition mean min max ZT0-3 18.399211666666666 10.285834999999999 25.09285 ZT4-7 12.398795 12.398795 12.398795 ZT8-11 13.57995 13.57995 13.57995 ZT12-15 17.637775 12.90525 22.3703 ZT16-19 25.93665 25.93665 25.93665 ZT20-23 33.78475 33.78475 33.78475