condition mean min max ZT0-3 8.25144314825 7.104736009 9.3981502875 ZT4-7 11.43678876 10.29216294 12.58141458 ZT8-11 12.92453668 12.11550008 13.73357328 ZT12-15 9.9285742585 9.18231291 10.674835607 ZT16-19 9.0049919935 8.349924593499999 9.6600593935 ZT20-23 9.9802939055 9.4736160245 10.4869717865