condition mean min max ZT0-3 0.27635873499999997 0.19186248 0.36085499 ZT4-7 0.8228205565 0.6340775869999999 1.011563526 ZT8-11 2.1813825637499997 1.3435835269999998 3.0191816004999996 ZT12-15 5.436707136 4.622363148 6.251051124 ZT16-19 5.6370826155 5.6323951165 5.6417701145 ZT20-23 4.7847802134999995 4.5202082914999995 5.0493521354999995