condition mean min max ZT0-3 0.10367991375 0.0 0.2073598275 ZT4-7 2.04514375525 1.3364758094999998 2.753811701 ZT8-11 3.0898418415 2.7583703445 3.4213133385 ZT12-15 2.99556501075 2.3926533295 3.598476692 ZT16-19 5.55052984875 4.8784558780000005 6.2226038195 ZT20-23 6.087890018 5.473975187500001 6.7018048485