condition mean min max ZT0-3 2.7327275 2.543215 2.92224 ZT4-7 2.88455 2.88455 2.88455 ZT8-11 2.359025 2.359025 2.359025 ZT12-15 0 0 0 ZT16-19 4.441465 4.441465 4.441465 ZT20-23 3.0756550000000002 3.0756550000000002 3.0756550000000002