condition mean min max ZT0-3 30.764083333333332 11.6293 41.621399999999994 ZT4-7 13.6414 13.6414 13.6414 ZT8-11 7.183025 7.183025 7.183025 ZT12-15 25.516475 12.5845 38.44845 ZT16-19 37.231049999999996 37.231049999999996 37.231049999999996 ZT20-23 44.00945 44.00945 44.00945