condition mean min max ZT0-3 1.4416175 1.374415 1.50882 ZT4-7 2.210355 2.210355 2.210355 ZT8-11 1.2884039999999999 1.2884039999999999 1.2884039999999999 ZT12-15 0 0 0 ZT16-19 2.284335 2.284335 2.284335 ZT20-23 2.979735 2.979735 2.979735