condition mean min max ZT0-3 221.442751 221.442751 221.442751 ZT4-7 207.743137 207.743137 207.743137 ZT8-11 213.433225 213.433225 213.433225 ZT12-15 236.525811 236.525811 236.525811 ZT16-19 238.1722235 238.1722235 238.1722235 ZT20-23 275.6759095 275.6759095 275.6759095