condition mean min max ZT0-3 18.3354 18.3354 18.3354 ZT4-7 15.442 15.442 15.442 ZT8-11 16.10895 16.10895 16.10895 ZT12-15 15.5947 15.5947 15.5947 ZT16-19 20.3158 20.3158 20.3158 ZT20-23 17.8596 17.8596 17.8596