condition mean min max ZT0-3 354.005331 354.005331 354.005331 ZT4-7 546.324209 546.324209 546.324209 ZT8-11 738.3286455 738.3286455 738.3286455 ZT12-15 786.949294 786.949294 786.949294 ZT16-19 651.8874585 651.8874585 651.8874585 ZT20-23 553.177625 553.177625 553.177625