condition mean min max ZT0-3 5.21832 5.21832 5.21832 ZT4-7 2.330275 2.330275 2.330275 ZT8-11 2.8170349999999997 2.8170349999999997 2.8170349999999997 ZT12-15 3.304485 3.304485 3.304485 ZT16-19 8.51783 8.51783 8.51783 ZT20-23 5.64404 5.64404 5.64404