condition mean min max ZT0-3 58.88087707 56.88560916 60.87614498 ZT4-7 41.912415190000004 39.65874361 44.16608677 ZT8-11 48.081161519999995 40.754058885 55.408264155 ZT12-15 24.356708889999997 13.000447784999999 35.712969994999995 ZT16-19 16.608223915 15.982786635 17.233661195 ZT20-23 17.594257315 17.349153575000003 17.839361054999998