condition mean min max ZT0-3 9.138912 9.138912 9.138912 ZT4-7 11.19146 11.19146 11.19146 ZT8-11 10.4561405 10.4561405 10.4561405 ZT12-15 16.077546 16.077546 16.077546 ZT16-19 10.620976500000001 10.620976500000001 10.620976500000001 ZT20-23 13.244802499999999 13.244802499999999 13.244802499999999