condition mean min max ZT0-3 51.487293 51.487293 51.487293 ZT4-7 78.1321135 78.1321135 78.1321135 ZT8-11 81.3650335 81.3650335 81.3650335 ZT12-15 58.04562200000001 58.04562200000001 58.04562200000001 ZT16-19 38.8246825 38.8246825 38.8246825 ZT20-23 30.7558335 30.7558335 30.7558335