condition mean min max ZT0-3 1.52409612025 1.23280705 1.8153851905000002 ZT4-7 4.3651353785 3.243257756 5.487013000999999 ZT8-11 6.49854662725 5.798087927999999 7.1990053265 ZT12-15 17.35878025 13.86844544 20.84911506 ZT16-19 18.8788001325 18.171614990000002 19.585985275 ZT20-23 28.2067623 25.987301705 30.426222895