condition mean min max ZT0-3 14.887183195000002 4.692505447 25.081860943000002 ZT4-7 49.713281075 41.524147305 57.902414844999996 ZT8-11 37.80073682 32.03709185 43.56438179 ZT12-15 16.054781586 16.04011148 16.069451692 ZT16-19 21.9144739525 20.04547359 23.783474315 ZT20-23 26.95814129 24.439164285 29.477118295