condition mean min max ZT0-3 5.0054 5.0054 5.0054 ZT4-7 2.55847 2.55847 2.55847 ZT8-11 4.957825 4.957825 4.957825 ZT12-15 8.147245 8.147245 8.147245 ZT16-19 8.946455 8.946455 8.946455 ZT20-23 5.50599 5.50599 5.50599