condition mean min max ZT0-3 1.0537643333333333 0.6142610000000001 1.74735 ZT4-7 0.6052175 0.6052175 0.6052175 ZT8-11 0.45033049999999997 0.45033049999999997 0.45033049999999997 ZT12-15 0.814951 0.7452065 0.8846955000000001 ZT16-19 0.77403 0.77403 0.77403 ZT20-23 1.4430749999999999 1.4430749999999999 1.4430749999999999