condition mean min max ZT0-3 516.167556175 489.99550045 542.3396118999999 ZT4-7 579.7211423166666 573.9661226333333 585.4761619999999 ZT8-11 451.43570518333337 362.0734561666667 540.7979542 ZT12-15 360.4365522 326.1469224 394.726182 ZT16-19 381.2585915333333 335.4347108333333 427.0824722333333 ZT20-23 274.14104115 262.1182773 286.163805