condition mean min max ZT0-3 0.6387868333333333 0.572026 0.737225 ZT4-7 1.1169 1.1169 1.1169 ZT8-11 0.9878765 0.9878765 0.9878765 ZT12-15 1.886945 1.33752 2.43637 ZT16-19 1.24823 1.24823 1.24823 ZT20-23 1.16684 1.16684 1.16684