condition mean min max ZT0-3 13.29969 13.29969 13.29969 ZT4-7 15.8043725 15.8043725 15.8043725 ZT8-11 12.046033999999999 12.046033999999999 12.046033999999999 ZT12-15 13.282055 13.282055 13.282055 ZT16-19 13.1248385 13.1248385 13.1248385 ZT20-23 12.064688 12.064688 12.064688