condition mean min max ZT0-3 5.16293 5.061 5.2648600000000005 ZT4-7 5.80045 5.80045 5.80045 ZT8-11 4.867575 4.867575 4.867575 ZT12-15 0 0 0 ZT16-19 5.9443850000000005 5.9443850000000005 5.9443850000000005 ZT20-23 4.663565 4.663565 4.663565