condition mean min max ZT0-3 127.303985 127.303985 127.303985 ZT4-7 249.55976400000003 249.55976400000003 249.55976400000003 ZT8-11 282.705549 282.705549 282.705549 ZT12-15 237.116672 237.116672 237.116672 ZT16-19 166.4509335 166.4509335 166.4509335 ZT20-23 143.9858935 143.9858935 143.9858935