condition mean min max ZT0-3 387.252325 387.252325 387.252325 ZT4-7 861.1195885 861.1195885 861.1195885 ZT8-11 869.6188995 869.6188995 869.6188995 ZT12-15 740.5878475 740.5878475 740.5878475 ZT16-19 666.9513365 666.9513365 666.9513365 ZT20-23 572.998007 572.998007 572.998007