condition mean min max ZT0-3 7.491287499999999 6.3972 8.585374999999999 ZT4-7 5.312139999999999 5.312139999999999 5.312139999999999 ZT8-11 5.075855 5.075855 5.075855 ZT12-15 0 0 0 ZT16-19 19.45725 19.45725 19.45725 ZT20-23 9.02029 9.02029 9.02029