condition mean min max ZT0-3 338.163382 338.163382 338.163382 ZT4-7 263.95469049999997 263.95469049999997 263.95469049999997 ZT8-11 216.036095 216.036095 216.036095 ZT12-15 279.759151 279.759151 279.759151 ZT16-19 216.64361100000002 216.64361100000002 216.64361100000002 ZT20-23 235.3008105 235.3008105 235.3008105