condition mean min max ZT0-3 2.3811424605 2.1226639140000003 2.6396210069999997 ZT4-7 5.21445737025 3.824864525 6.6040502155 ZT8-11 10.72863426675 9.108650083499999 12.34861845 ZT12-15 8.70405443125 7.147411002 10.2606978605 ZT16-19 4.34733686375 4.321927496000001 4.3727462315 ZT20-23 3.010989472 2.7527983715 3.2691805725