condition mean min max ZT0-3 24.14927324 18.3189944 29.97955208 ZT4-7 19.0753990675 17.03628519 21.114512945 ZT8-11 23.6434932975 20.084560070000002 27.202426525 ZT12-15 43.380304497500006 40.411914870000004 46.348694125 ZT16-19 64.2378198375 57.621771435 70.85386824 ZT20-23 93.3692079425 85.01357904 101.724836845