condition mean min max ZT0-3 75.225427 75.225427 75.225427 ZT4-7 68.1148735 68.1148735 68.1148735 ZT8-11 84.86106649999999 84.86106649999999 84.86106649999999 ZT12-15 79.57433549999999 79.57433549999999 79.57433549999999 ZT16-19 94.6057615 94.6057615 94.6057615 ZT20-23 62.9590745 62.9590745 62.9590745