condition mean min max ZT0-3 59.095628 59.095628 59.095628 ZT4-7 79.27609000000001 79.27609000000001 79.27609000000001 ZT8-11 86.597958 86.597958 86.597958 ZT12-15 87.1360345 87.1360345 87.1360345 ZT16-19 97.439427 97.439427 97.439427 ZT20-23 85.44931600000001 85.44931600000001 85.44931600000001