condition mean min max ZT0-3 6.267202500000001 5.8907050000000005 6.643700000000001 ZT4-7 15.135250000000001 15.135250000000001 15.135250000000001 ZT8-11 18.42325 18.42325 18.42325 ZT12-15 0 0 0 ZT16-19 10.77935 10.77935 10.77935 ZT20-23 9.23358 9.23358 9.23358