condition mean min max ZT0-3 199.463268 199.463268 199.463268 ZT4-7 188.12372599999998 188.12372599999998 188.12372599999998 ZT8-11 147.4370615 147.4370615 147.4370615 ZT12-15 148.845034 148.845034 148.845034 ZT16-19 137.0706495 137.0706495 137.0706495 ZT20-23 113.2804545 113.2804545 113.2804545