condition mean min max ZT0-3 246.1050586 190.04242090000002 302.1676963 ZT4-7 212.8308106 203.15663745 222.50498375 ZT8-11 116.759909355 86.669593585 146.850225125 ZT12-15 28.760642324000003 20.858462815 36.662821833 ZT16-19 44.411620755 43.624231705 45.199009805 ZT20-23 36.244676635 31.01329369 41.47605958