condition mean min max ZT0-3 69.90118333333334 56.4132 81.4123 ZT4-7 77.1349 77.1349 77.1349 ZT8-11 229.178 229.178 229.178 ZT12-15 279.7435 271.7795 287.7075 ZT16-19 194.203 194.203 194.203 ZT20-23 111.59700000000001 111.59700000000001 111.59700000000001