condition mean min max ZT0-3 41.97825 41.97825 41.97825 ZT4-7 13.8397 13.8397 13.8397 ZT8-11 9.74673 9.74673 9.74673 ZT12-15 100.34385 100.34385 100.34385 ZT16-19 198.07150000000001 198.07150000000001 198.07150000000001 ZT20-23 112.97225 112.97225 112.97225