condition mean min max ZT0-3 1.3776480000000002 0.9028959999999999 1.8524000000000003 ZT4-7 2.009395 2.009395 2.009395 ZT8-11 3.12175 3.12175 3.12175 ZT12-15 0 0 0 ZT16-19 3.751095 3.751095 3.751095 ZT20-23 2.4293750000000003 2.4293750000000003 2.4293750000000003