condition mean min max ZT0-3 124.137275 124.137275 124.137275 ZT4-7 130.35247 130.35247 130.35247 ZT8-11 167.315414 167.315414 167.315414 ZT12-15 166.8987485 166.8987485 166.8987485 ZT16-19 159.3654585 159.3654585 159.3654585 ZT20-23 143.940945 143.940945 143.940945