condition mean min max ZT0-3 54.4481 54.4481 54.4481 ZT4-7 44.92765 44.92765 44.92765 ZT8-11 51.80025 51.80025 51.80025 ZT12-15 64.0881 64.0881 64.0881 ZT16-19 74.8939 74.8939 74.8939 ZT20-23 50.62585 50.62585 50.62585