condition mean min max ZT0-3 0.5989599999999999 0.5989599999999999 0.5989599999999999 ZT4-7 1.238224 1.238224 1.238224 ZT8-11 1.3027220000000002 1.3027220000000002 1.3027220000000002 ZT12-15 1.121088 1.121088 1.121088 ZT16-19 1.4869949999999998 1.4869949999999998 1.4869949999999998 ZT20-23 0.8030079999999999 0.8030079999999999 0.8030079999999999