condition mean min max ZT0-3 11.72305 11.72305 11.72305 ZT4-7 9.58588 9.58588 9.58588 ZT8-11 8.30044 8.30044 8.30044 ZT12-15 9.09492 9.09492 9.09492 ZT16-19 13.86995 13.86995 13.86995 ZT20-23 10.838899999999999 10.838899999999999 10.838899999999999