condition mean min max ZT0-3 6.3736025000000005 5.622395 7.12481 ZT4-7 6.16275 6.16275 6.16275 ZT8-11 5.83362 5.83362 5.83362 ZT12-15 0 0 0 ZT16-19 6.7244150000000005 6.7244150000000005 6.7244150000000005 ZT20-23 6.451615 6.451615 6.451615