condition mean min max ZT0-3 23.237636 23.237636 23.237636 ZT4-7 38.040172999999996 38.040172999999996 38.040172999999996 ZT8-11 42.1118435 42.1118435 42.1118435 ZT12-15 47.412208 47.412208 47.412208 ZT16-19 41.845864 41.845864 41.845864 ZT20-23 30.356273 30.356273 30.356273