condition mean min max ZT0-3 4.349375 4.349375 4.349375 ZT4-7 4.15505 4.15505 4.15505 ZT8-11 3.410505 3.410505 3.410505 ZT12-15 3.8146050000000002 3.8146050000000002 3.8146050000000002 ZT16-19 4.19958 4.19958 4.19958 ZT20-23 3.8680700000000003 3.8680700000000003 3.8680700000000003