condition mean min max ZT0-3 26.80105 26.80105 26.80105 ZT4-7 780.8405 780.8405 780.8405 ZT8-11 170.4235 170.4235 170.4235 ZT12-15 19.69475 19.69475 19.69475 ZT16-19 6.829695 6.829695 6.829695 ZT20-23 2.50207 2.50207 2.50207