condition mean min max ZT0-3 1040.077368 1040.077368 1040.077368 ZT4-7 279.792044 279.792044 279.792044 ZT8-11 16.338849500000002 16.338849500000002 16.338849500000002 ZT12-15 42.293606 42.293606 42.293606 ZT16-19 12.5293435 12.5293435 12.5293435 ZT20-23 33.4050235 33.4050235 33.4050235