condition mean min max ZT0-3 1631.986708 1631.986708 1631.986708 ZT4-7 1270.0241405 1270.0241405 1270.0241405 ZT8-11 1397.106957 1397.106957 1397.106957 ZT12-15 1626.4071085 1626.4071085 1626.4071085 ZT16-19 1840.3698215 1840.3698215 1840.3698215 ZT20-23 2297.2083620000003 2297.2083620000003 2297.2083620000003