condition mean min max ZT0-3 10.662762 10.662762 10.662762 ZT4-7 11.111297 11.111297 11.111297 ZT8-11 9.281393 9.281393 9.281393 ZT12-15 9.0931055 9.0931055 9.0931055 ZT16-19 8.2108025 8.2108025 8.2108025 ZT20-23 8.699124000000001 8.699124000000001 8.699124000000001