condition mean min max ZT0-3 902.251397 902.251397 902.251397 ZT4-7 581.7835835000001 581.7835835000001 581.7835835000001 ZT8-11 577.321011 577.321011 577.321011 ZT12-15 643.4238385 643.4238385 643.4238385 ZT16-19 684.2275935 684.2275935 684.2275935 ZT20-23 534.8978095 534.8978095 534.8978095