condition mean min max ZT0-3 2551.6 2551.6 2551.6 ZT4-7 3070.4 3070.4 3070.4 ZT8-11 2719.3999999999996 2719.3999999999996 2719.3999999999996 ZT12-15 2544.9 2544.9 2544.9 ZT16-19 2579.9 2579.9 2579.9 ZT20-23 2589.2 2589.2 2589.2