condition mean min max ZT0-3 222.462826 222.462826 222.462826 ZT4-7 194.56382150000002 194.56382150000002 194.56382150000002 ZT8-11 233.51619 233.51619 233.51619 ZT12-15 302.3006 302.3006 302.3006 ZT16-19 305.719236 305.719236 305.719236 ZT20-23 309.116672 309.116672 309.116672