condition mean min max ZT0-3 3.6285240919999997 1.620366152 5.6366820319999995 ZT4-7 16.136839610000003 13.926370460000001 18.34730876 ZT8-11 18.565634787500002 17.44551027 19.685759305 ZT12-15 40.175153435 37.20696133 43.14334554 ZT16-19 38.703567095 35.27897048 42.128163709999995 ZT20-23 37.713963892500004 35.86366743 39.564260355