condition mean min max ZT0-3 1.666645 1.666645 1.666645 ZT4-7 1.6661350000000001 1.6661350000000001 1.6661350000000001 ZT8-11 1.80763 1.80763 1.80763 ZT12-15 1.68606 1.68606 1.68606 ZT16-19 1.73543 1.73543 1.73543 ZT20-23 1.594335 1.594335 1.594335