condition mean min max ZT0-3 6.030835838250001 5.611544532000001 6.450127144500001 ZT4-7 7.6078015715000005 7.5503093415 7.665293801500001 ZT8-11 12.215338134749999 9.3512236695 15.0794526 ZT12-15 23.4416516075 21.55075717 25.332546045 ZT16-19 21.4095708675 20.034687075 22.78445466 ZT20-23 17.0465512675 16.820909025 17.27219351