condition mean min max ZT0-3 8.93293185975 6.9946170295000005 10.87124669 ZT4-7 6.70947589275 5.616304553999999 7.8026472315 ZT8-11 9.66957240425 8.5949103735 10.744234435 ZT12-15 11.390897665499999 10.3513585135 12.430436817499999 ZT16-19 12.1971187975 10.888061234999999 13.506176360000001 ZT20-23 21.884237480000003 19.650907525 24.117567435