condition mean min max ZT0-3 444.342076 444.342076 444.342076 ZT4-7 252.882815 252.882815 252.882815 ZT8-11 265.034918 265.034918 265.034918 ZT12-15 306.753509 306.753509 306.753509 ZT16-19 355.85049449999997 355.85049449999997 355.85049449999997 ZT20-23 502.56214750000004 502.56214750000004 502.56214750000004