condition mean min max ZT0-3 1.06109425 0.7913435 1.330845 ZT4-7 0.6268560000000001 0.6268560000000001 0.6268560000000001 ZT8-11 1.688455 1.688455 1.688455 ZT12-15 0 0 0 ZT16-19 1.4586549999999998 1.4586549999999998 1.4586549999999998 ZT20-23 1.531365 1.531365 1.531365