condition mean min max ZT0-3 68.21111111 68.21111111 68.21111111 ZT4-7 86.765 86.765 86.765 ZT8-11 109.28055556666666 109.28055556666666 109.28055556666666 ZT12-15 122.76222222333332 122.76222222333332 122.76222222333332 ZT16-19 90.11222221999999 90.11222221999999 90.11222221999999 ZT20-23 74.74888889 74.74888889 74.74888889