condition mean min max ZT0-3 199.293901 199.293901 199.293901 ZT4-7 577.6034515 577.6034515 577.6034515 ZT8-11 668.5475455000001 668.5475455000001 668.5475455000001 ZT12-15 486.643062 486.643062 486.643062 ZT16-19 282.284364 282.284364 282.284364 ZT20-23 202.5860235 202.5860235 202.5860235