condition mean min max ZT0-3 2009.249657 1277.488191 2741.011123 ZT4-7 2977.89850125 2766.8989030000002 3188.8980995 ZT8-11 2605.5735274999997 2568.160129 2642.986926 ZT12-15 1169.7222563750001 690.85775475 1648.5867580000001 ZT16-19 169.904664125 156.88007670000002 182.92925155 ZT20-23 165.47332785 153.69903855 177.24761715