condition mean min max ZT0-3 5.980145 5.980145 5.980145 ZT4-7 4.123305 4.123305 4.123305 ZT8-11 13.2259 13.2259 13.2259 ZT12-15 19.8009 19.8009 19.8009 ZT16-19 19.0704 19.0704 19.0704 ZT20-23 8.908215 8.908215 8.908215