condition mean min max ZT0-3 419.944772 419.944772 419.944772 ZT4-7 548.48654 548.48654 548.48654 ZT8-11 520.54115 520.54115 520.54115 ZT12-15 508.151274 508.151274 508.151274 ZT16-19 546.194124 546.194124 546.194124 ZT20-23 456.51754700000004 456.51754700000004 456.51754700000004