condition mean min max ZT0-3 9.499523 9.499523 9.499523 ZT4-7 9.134331 9.134331 9.134331 ZT8-11 10.353311999999999 10.353311999999999 10.353311999999999 ZT12-15 8.931017 8.931017 8.931017 ZT16-19 8.428845500000001 8.428845500000001 8.428845500000001 ZT20-23 9.4308215 9.4308215 9.4308215