condition mean min max ZT0-3 10.391312 10.391312 10.391312 ZT4-7 9.366842 9.366842 9.366842 ZT8-11 10.288247 10.288247 10.288247 ZT12-15 9.291145499999999 9.291145499999999 9.291145499999999 ZT16-19 9.775452 9.775452 9.775452 ZT20-23 9.782338 9.782338 9.782338