condition mean min max ZT0-3 302.144988 302.144988 302.144988 ZT4-7 266.159375 266.159375 266.159375 ZT8-11 276.442323 276.442323 276.442323 ZT12-15 333.6166725 333.6166725 333.6166725 ZT16-19 463.4040145 463.4040145 463.4040145 ZT20-23 568.521042 568.521042 568.521042