condition mean min max ZT0-3 1.793595 1.793595 1.793595 ZT4-7 1.419695 1.419695 1.419695 ZT8-11 1.366085 1.366085 1.366085 ZT12-15 1.1180205 1.1180205 1.1180205 ZT16-19 2.8736249999999997 2.8736249999999997 2.8736249999999997 ZT20-23 1.8663699999999999 1.8663699999999999 1.8663699999999999