condition mean min max ZT0-3 7.0103 6.379385 7.641215 ZT4-7 5.822229999999999 5.822229999999999 5.822229999999999 ZT8-11 6.42665 6.42665 6.42665 ZT12-15 0 0 0 ZT16-19 6.7543 6.7543 6.7543 ZT20-23 7.86856 7.86856 7.86856