condition mean min max ZT0-3 100.041825 99.52465000000001 100.559 ZT4-7 79.8195 79.8195 79.8195 ZT8-11 169.7775 169.7775 169.7775 ZT12-15 0 0 0 ZT16-19 201.372 201.372 201.372 ZT20-23 154.3025 154.3025 154.3025