condition mean min max ZT0-3 2.74382 2.74382 2.74382 ZT4-7 2.11321 2.11321 2.11321 ZT8-11 2.960375 2.960375 2.960375 ZT12-15 3.09025 3.09025 3.09025 ZT16-19 5.09109 5.09109 5.09109 ZT20-23 3.77107 3.77107 3.77107