condition mean min max ZT0-3 28.48075 28.48075 28.48075 ZT4-7 35.45025 35.45025 35.45025 ZT8-11 3.336785 3.336785 3.336785 ZT12-15 4.18047 4.18047 4.18047 ZT16-19 10.330235 10.330235 10.330235 ZT20-23 17.3268 17.3268 17.3268