condition mean min max ZT0-3 0.48731419025 0.33892780299999997 0.6357005775 ZT4-7 1.4040308019999999 0.9536147119999999 1.854446892 ZT8-11 4.082431576499999 2.863585631 5.3012775219999995 ZT12-15 6.032080521749999 5.4798242644999995 6.584336778999999 ZT16-19 2.6804566984999996 2.434195188 2.9267182089999997 ZT20-23 4.234545632 3.7306093220000003 4.738481942