condition mean min max ZT0-3 538.511873 538.511873 538.511873 ZT4-7 695.1267305 695.1267305 695.1267305 ZT8-11 1366.7167675 1366.7167675 1366.7167675 ZT12-15 1117.9364265 1117.9364265 1117.9364265 ZT16-19 1125.6361735 1125.6361735 1125.6361735 ZT20-23 455.456513 455.456513 455.456513