condition mean min max ZT0-3 793.885279 793.885279 793.885279 ZT4-7 682.644508 682.644508 682.644508 ZT8-11 1176.6580345 1176.6580345 1176.6580345 ZT12-15 1122.882523 1122.882523 1122.882523 ZT16-19 2016.713588 2016.713588 2016.713588 ZT20-23 1583.6023395000002 1583.6023395000002 1583.6023395000002