condition mean min max ZT0-3 25.9402 18.60165 39.38145 ZT4-7 31.44705 31.44705 31.44705 ZT8-11 21.75785 21.75785 21.75785 ZT12-15 18.5046 14.3027 22.7065 ZT16-19 23.57295 23.57295 23.57295 ZT20-23 17.0026 17.0026 17.0026