condition mean min max ZT0-3 206.64999999999998 206.64999999999998 206.64999999999998 ZT4-7 148.9 148.9 148.9 ZT8-11 185.3 185.3 185.3 ZT12-15 242.95000000000002 242.95000000000002 242.95000000000002 ZT16-19 229.85000000000002 229.85000000000002 229.85000000000002 ZT20-23 173.45 173.45 173.45