condition mean min max ZT0-3 0.40013350000000003 0.30322550000000004 0.5185755000000001 ZT4-7 0.3128845 0.3128845 0.3128845 ZT8-11 1.102065 1.102065 1.102065 ZT12-15 1.15701425 1.1502750000000002 1.1637535 ZT16-19 1.0346215 1.0346215 1.0346215 ZT20-23 0.831344 0.831344 0.831344